Contract 0xbc655c39788f6a9b16f75712a479af71229465b0

//SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import './YetubitToken.sol';

interface IStdReference {
    /// A structure returned whenever someone requests for standard reference data.
    struct ReferenceData {
        uint256 rate; // base/quote exchange rate, multiplied by 1e18.
        uint256 lastUpdatedBase; // UNIX epoch of the last time when base price gets updated.
        uint256 lastUpdatedQuote; // UNIX epoch of the last time when quote price gets updated.
    }

    /// Returns the price data for the given base/quote pair. Revert if not available.
    function getReferenceData(string memory _base, string memory _quote)
        external
        view
        returns (ReferenceData memory);
}

contract YetuTokensCrowdsale {
    
        using SafeMath for uint256;
        IStdReference internal ref;
        
        /**
       * Event for YetuTokens purchase logging
       * @param purchaser who paid for the tokens
       * @param beneficiary who got the tokens
       * @param value bnbs paid for purchase
       * @param YetuTokenAmount amount of Yetu tokens purchased
       */
        event TokenPurchase(
            address indexed purchaser,
            address indexed beneficiary,
            uint256 value,
            uint256 YetuTokenAmount
        );
    
       bool public isEnded = false;
    
       event Ended(uint256 totalBNBRaisedInCrowdsale,uint256 unsoldTokensTransferredToOwner);
       
       uint256 public currentYetuTokenUSDPrice;     //YetuTokens in $USD 
       
       YetubitToken public yetu;
       
       uint8 public currentCrowdsaleStage;

      // Yetu Token Distribution
      // =============================
      uint256 public totalYetuTokensForSale = 60000000*(1e18); // 60,000,000 Yetu will be sold during the whole Crowdsale
      // ==============================
      
      // Amount of bnb raised in Crowdsale
      // ==================
      uint256 public totalBNBRaised;
      // ===================
    
      // Crowdsale Stages Details
      // ==================
       mapping (uint256 => uint256) public remainingYetuInStage;
       mapping (uint256 => uint256) public yetuUSDPriceInStages;
      // ===================
    
      // Events
      event BNBTransferred(string text);
      
      //Modifier
        address payable public owner;    
        modifier onlyOwner() {
            require (msg.sender == owner);
            _;
        }
    
      // Constructor
      // ============
      constructor() public       
      {   
          owner = msg.sender;
          currentCrowdsaleStage = 1;
          
          remainingYetuInStage[1] = 5000000*1e18;   // 5,000,000 Yetu will be sold during the Stage 1
          remainingYetuInStage[2] = 20000000*1e18;  // 20,000,000 Yetu will be sold during the Stage 2
          remainingYetuInStage[3] = 20000000*1e18;  // 20,000,000 Yetu will be sold during the Stage 3
          remainingYetuInStage[4] = 10000000*1e18;  // 10,000,000 Yetu will be sold during the Stage 4
          remainingYetuInStage[5] = 5000000*1e18;   // 5,000,000 Yetu will be sold during the Stage 5
          
          yetuUSDPriceInStages[1] = 40000000000000000;    //$0.04
          yetuUSDPriceInStages[2] = 80000000000000000;    //$0.08
          yetuUSDPriceInStages[3] = 200000000000000000;   //$0.2
          yetuUSDPriceInStages[4] = 400000000000000000;   //$0.4
          yetuUSDPriceInStages[5] = 800000000000000000;   //$0.8
        
          currentYetuTokenUSDPrice = yetuUSDPriceInStages[1];       
          
          ref = IStdReference(0xDA7a001b254CD22e46d3eAB04d937489c93174C3);
          yetu = new YetubitToken(owner); // Yetu Token Deployment
      }
      // =============

      // Change Crowdsale Stage. 
      function switchToNextStage() public onlyOwner {
          currentCrowdsaleStage = currentCrowdsaleStage + 1;
          if((currentCrowdsaleStage == 6) || (currentCrowdsaleStage == 0)){
              endCrowdsale();
          }
          currentYetuTokenUSDPrice = yetuUSDPriceInStages[currentCrowdsaleStage]; 
      }
      
       /**
       * @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met. Use super to concatenate validations.
       * @param _beneficiary Address performing the YetuToken purchase
       */
      function _preValidatePurchase(
        address _beneficiary
      )
        internal pure
      {
        require(_beneficiary != address(0));
      }
    
      /**
       * @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends its tokens.
       * @param _beneficiary Address performing the YetuTokens purchase
       * @param _tokenAmount Number of Yetu tokens to be purchased
       */
      function _deliverTokens(
        address _beneficiary,
        uint256 _tokenAmount
      )
        internal
      {
        yetu.transfer(_beneficiary, _tokenAmount);
      }
    
      /**
       * @dev Executed when a purchase has been validated and is ready to be executed. Not necessarily emits/sends tokens.
       * @param _beneficiary Address receiving the tokens
       * @param _tokenAmount Number of Yetu tokens to be purchased
       */
      function _processPurchase(
        address _beneficiary,
        uint256 _tokenAmount
      )
        internal
      {
        _deliverTokens(_beneficiary, _tokenAmount);
      }
    
      /**
       * @dev Override to extend the way in which bnb is converted to tokens.
       * @param _bnbAmount Value in bnb to be converted into tokens
       * @return Number of tokens that can be purchased with the specified _bnbAmount
       */
      function _getTokenAmount(uint256 _bnbAmount)
        internal view returns (uint256)
      {
        return _bnbAmount.mul(getLatestBNBPrice()).div(currentYetuTokenUSDPrice);
      }
      
      
      // YetuTokens Purchase
      // =========================
      receive() external payable {
          if(isEnded){
              revert(); //Block Incoming BNB Deposits if Crowdsale has ended
          }
          buyYetuTokens(msg.sender);
      }
      
      function buyYetuTokens(address _beneficiary) public payable {
          uint256 bnbAmount = msg.value;
          require(bnbAmount > 0,"Please Send some BNB");
          if(isEnded){
            revert();
          }
          
          _preValidatePurchase(_beneficiary);
          uint256 YetuTokensToBePurchased = _getTokenAmount(bnbAmount);
          if (YetuTokensToBePurchased > remainingYetuInStage[currentCrowdsaleStage]) {
             revert();  //Block Incoming BNB Deposits if tokens to be purchased, exceeds remaining tokens for sale in the current stage
          }
            _processPurchase(_beneficiary, YetuTokensToBePurchased);
            emit TokenPurchase(
              msg.sender,
              _beneficiary,
              bnbAmount,
              YetuTokensToBePurchased
            );
            
          totalBNBRaised = totalBNBRaised.add(bnbAmount);
          remainingYetuInStage[currentCrowdsaleStage] = remainingYetuInStage[currentCrowdsaleStage].sub(YetuTokensToBePurchased);
          
          if(remainingYetuInStage[currentCrowdsaleStage] == 0){
              switchToNextStage();      // Switch to Next Crowdsale Stage when all tokens allocated for current stage are being sold out
          }
          
      }
      
      // Finish: Finalizing the Crowdsale.
      // ====================================================================
    
      function endCrowdsale() public onlyOwner {
          require(!isEnded,"Crowdsale already finalized");   
          uint256 unsoldTokens = yetu.balanceOf(address(this));
                                                              
          if (unsoldTokens > 0) {
              yetu.burn(unsoldTokens);
          }
          for(uint8 i = 1; i<=5; i++){
             remainingYetuInStage[i] = 0;   
          }

          currentCrowdsaleStage = 0;
          emit Ended(totalBNBRaised,unsoldTokens);
          isEnded = true;
      }
      // ===============================
        
      function yetuTokenBalance(address tokenHolder) external view returns(uint256 balance){
          return yetu.balanceOf(tokenHolder);
      }

    /**
     * Returns the latest BNB-USD price
     */
    function getLatestBNBPrice() public view returns (uint256){
        IStdReference.ReferenceData memory data = ref.getReferenceData("BNB","USD");
        return data.rate;
    }

    function withdrawFunds(uint256 amount) public onlyOwner {
        require(amount <= address(this).balance,"Insufficient Funds");
        owner.transfer(amount);
        emit BNBTransferred("Funds Withdrawn to Owner Account");
    }
      
    function transferYetuOwnership(address _newOwner) public onlyOwner{
        return yetu.transferOwnership(_newOwner);
    }
    }

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IBEP20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external view returns (uint8);

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external view returns (string memory);

  /**
  * @dev Returns the token name.
  */
  function name() external view returns (string memory);

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external view returns (address);

  /**
   * @dev Returns the amount of tokens owned by `account`.
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @dev Moves `amount` tokens from the caller's account to `recipient`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Returns the remaining number of tokens that `spender` will be
   * allowed to spend on behalf of `owner` through {transferFrom}. This is
   * zero by default.
   *
   * This value changes when {approve} or {transferFrom} are called.
   */
  function allowance(address _owner, address spender) external view returns (uint256);

  /**
   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * IMPORTANT: Beware that changing an allowance with this method brings the risk
   * that someone may use both the old and the new allowance by unfortunate
   * transaction ordering. One possible solution to mitigate this race
   * condition is to first reduce the spender's allowance to 0 and set the
   * desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   *
   * Emits an {Approval} event.
   */
  function approve(address spender, uint256 amount) external returns (bool);

  /**
   * @dev Moves `amount` tokens from `sender` to `recipient` using the
   * allowance mechanism. `amount` is then deducted from the caller's
   * allowance.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /**
   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
   * a call to {approve}. `value` is the new allowance.
   */
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
  // Empty internal constructor, to prevent people from mistakenly deploying
  // an instance of this contract, which should be used via inheritance.
  constructor () internal { }

  function _msgSender() internal view returns (address payable) {
    return msg.sender;
  }

  function _msgData() internal view returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
  /**
   * @dev Returns the addition of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `+` operator.
   *
   * Requirements:
   * - Addition cannot overflow.
   */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a, "SafeMath: addition overflow");

    return c;
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    return sub(a, b, "SafeMath: subtraction overflow");
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
    require(b <= a, errorMessage);
    uint256 c = a - b;

    return c;
  }

  /**
   * @dev Returns the multiplication of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `*` operator.
   *
   * Requirements:
   * - Multiplication cannot overflow.
   */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b, "SafeMath: multiplication overflow");

    return c;
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    return div(a, b, "SafeMath: division by zero");
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    return mod(a, b, "SafeMath: modulo by zero");
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts with custom message when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
  address private _owner;

  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  /**
   * @dev Initializes the contract setting the deployer as the initial owner.
   */
  constructor () internal {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() internal view returns (address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(_owner == _msgSender(), "Ownable: caller is not the owner");
    _;
  }

  /**
   * @dev Leaves the contract without owner. It will not be possible to call
   * `onlyOwner` functions anymore. Can only be called by the current owner.
   *
   * NOTE: Renouncing ownership will leave the contract without an owner,
   * thereby removing any functionality that is only available to the owner.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Can only be called by the current owner.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   */
  function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

contract YetubitToken is Context, IBEP20, Ownable {
  using SafeMath for uint256;

  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowances;

  uint256 private _totalSupply;
  uint8 private _decimals;
  string private _symbol;
  string private _name;
  uint256 public constant maxSupply = 300000000*1e18; //300,000,000 Yetubit Token
  
  constructor(address _dev) public {
    _name = "Yetucoin";
    _symbol = "YETU";
    _decimals = 18;
    
    address crowdsaleContract = msg.sender; //depoloyer is actually from the Crowdsale smart contract
	uint256 crowdsaleAllocation = 60000000*1e18; //60,000,000 Yetubit TOKEN Crowdsale Supply
    uint256 devFunds = 40000000*1e18;  //40,000,000 Yetubit TOKEN Dev Funds 
	
    _mint(crowdsaleContract, crowdsaleAllocation); //mint crowdsaleAllocation to Crowdsale Contract
    _mint(_dev, devFunds); //mint devFunds to Developer address
  }

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external override view returns (address) {
    return owner();
  }

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external override view returns (uint8) {
    return _decimals;
  }

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external override view returns (string memory) {
    return _symbol;
  }

  /**
  * @dev Returns the token name.
  */
  function name() external override view returns (string memory) {
    return _name;
  }

  /**
   * @dev See {BEP20-totalSupply}.
   */
  function totalSupply() external override view returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {BEP20-balanceOf}.
   */
  function balanceOf(address account) external override view returns (uint256) {
    return _balances[account];
  }

  /**
   * @dev See {BEP20-transfer}.
   *
   * Requirements:
   *
   * - `recipient` cannot be the zero address.
   * - the caller must have a balance of at least `amount`.
   */
  function transfer(address recipient, uint256 amount) external override returns (bool) {
    _transfer(_msgSender(), recipient, amount);
    return true;
  }

  /**
   * @dev See {BEP20-allowance}.
   */
  function allowance(address owner, address spender) external override view returns (uint256) {
    return _allowances[owner][spender];
  }

  /**
   * @dev See {BEP20-approve}.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function approve(address spender, uint256 amount) external override returns (bool) {
    _approve(_msgSender(), spender, amount);
    return true;
  }

  /**
   * @dev See {BEP20-transferFrom}.
   *
   * Emits an {Approval} event indicating the updated allowance. This is not
   * required by the EIP. See the note at the beginning of {BEP20};
   *
   * Requirements:
   * - `sender` and `recipient` cannot be the zero address.
   * - `sender` must have a balance of at least `amount`.
   * - the caller must have allowance for `sender`'s tokens of at least
   * `amount`.
   */
  function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
    _transfer(sender, recipient, amount);
    _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "BEP20: transfer amount exceeds allowance"));
    return true;
  }

  /**
   * @dev Atomically increases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {BEP20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
    return true;
  }

  /**
   * @dev Atomically decreases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {BEP20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   * - `spender` must have allowance for the caller of at least
   * `subtractedValue`.
   */
  function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "BEP20: decreased allowance below zero"));
    return true;
  }

  /**
   * @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
   * the total supply.
   *
   * Requirements
   *
   * - `msg.sender` must be the token owner
   */
  function mint(uint256 amount) public onlyOwner returns (bool) {
    require(_totalSupply.add(amount) <= maxSupply,"Max Supply Reached, no new tokens be minted");
    _mint(_msgSender(), amount);
    return true;
  }
  
  /**
   * @dev Moves tokens `amount` from `sender` to `recipient`.
   *
   * This is internal function is equivalent to {transfer}, and can be used to
   * e.g. implement automatic token fees, slashing mechanisms, etc.
   *
   * Emits a {Transfer} event.
   *
   * Requirements:
   *
   * - `sender` cannot be the zero address.
   * - `recipient` cannot be the zero address.
   * - `sender` must have a balance of at least `amount`.
   */
  function _transfer(address sender, address recipient, uint256 amount) internal {
    require(sender != address(0), "BEP20: transfer from the zero address");
    require(recipient != address(0), "BEP20: transfer to the zero address");

    _balances[sender] = _balances[sender].sub(amount, "BEP20: transfer amount exceeds balance");
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(sender, recipient, amount);
  }

  /** @dev Creates `amount` tokens and assigns them to `account`, increasing
   * the total supply.
   *
   * Emits a {Transfer} event with `from` set to the zero address.
   *
   * Requirements
   *
   * - `to` cannot be the zero address.
   */
  function _mint(address account, uint256 amount) internal {
    require(account != address(0), "BEP20: mint to the zero address");

    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }
  
  /**
   * @dev Destroys `amount` tokens from `account`, reducing the
   * total supply.
   *
   * Requirements
   *
   * - `msg.sender` must be the token owner
   */
  function burn(uint256 amount) public returns (bool) {
    _burn(_msgSender(), amount);
    return true;
  }

  /**
   * @dev Destroys `amount` tokens from `account`, reducing the
   * total supply.
   *
   * Emits a {Transfer} event with `to` set to the zero address.
   *
   * Requirements
   *
   * - `account` cannot be the zero address.
   * - `account` must have at least `amount` tokens.
   */
  function _burn(address account, uint256 amount) internal {
    require(account != address(0), "BEP20: burn from the zero address");

    _balances[account] = _balances[account].sub(amount, "BEP20: burn amount exceeds balance");
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(account, address(0), amount);
  }

  /**
   * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
   *
   * This is internal function is equivalent to `approve`, and can be used to
   * e.g. set automatic allowances for certain subsystems, etc.
   *
   * Emits an {Approval} event.
   *
   * Requirements:
   *
   * - `owner` cannot be the zero address.
   * - `spender` cannot be the zero address.
   */
  function _approve(address owner, address spender, uint256 amount) internal {
    require(owner != address(0), "BEP20: approve from the zero address");
    require(spender != address(0), "BEP20: approve to the zero address");

    _allowances[owner][spender] = amount;
    emit Approval(owner, spender, amount);
  }

  /**
   * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
   * from the caller's allowance.
   *
   * See {_burn} and {_approve}.
   */
  function burnFrom(address account, uint256 amount) public {
    _burn(account, amount);
    _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "BEP20: burn amount exceeds allowance"));
  }
}

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"text","type":"string"}],"name":"BNBTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"totalBNBRaisedInCrowdsale","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"unsoldTokensTransferredToOwner","type":"uint256"}],"name":"Ended","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"purchaser","type":"address"},{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"YetuTokenAmount","type":"uint256"}],"name":"TokenPurchase","type":"event"},{"inputs":[{"internalType":"address","name":"_beneficiary","type":"address"}],"name":"buyYetuTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"currentCrowdsaleStage","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentYetuTokenUSDPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"endCrowdsale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getLatestBNBPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isEnded","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"remainingYetuInStage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"switchToNextStage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalBNBRaised","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalYetuTokensForSale","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferYetuOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"yetu","outputs":[{"internalType":"contract YetubitToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenHolder","type":"address"}],"name":"yetuTokenBalance","outputs":[{"internalType":"uint256","name":"balance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"yetuUSDPriceInStages","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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