contract Ownable {
    address payable public owner;

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


    /**
    * @dev The Ownable constructor sets the original `owner` of the contract to the sender
    * account.
    */
    constructor() public {
        owner = msg.sender;
    }

    /**
    * @dev Throws if called by any account other than the owner.
    */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    // /**
    // * @dev Allows the current owner to relinquish control of the contract.
    // * @notice Renouncing to ownership will leave the contract without an owner.
    // * It will not be possible to call the functions with the `onlyOwner`
    // * modifier anymore.
    // */
    // function renounceOwnership() public onlyOwner {
    //     emit OwnershipRenounced(owner);
    //     owner = address(0);
    // }

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param _newOwner The address to transfer ownership to.
    */
    function transferOwnership(address payable _newOwner) public onlyOwner {
        _transferOwnership(_newOwner);
    }

    /**
    * @dev Transfers control of the contract to a newOwner.
    * @param _newOwner The address to transfer ownership to.
    */
    function _transferOwnership(address payable _newOwner) internal {
        require(_newOwner != address(0));
        emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;
    }
}
/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
function _transferOwnership(address payable _newOwner) internal {
        require(_newOwner != address(0));
        emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;
    }
/**
 * @dev Transfers control of the contract to a newOwner.
 * @param _newOwner The address to transfer ownership to.
 */