contract Ownable {
        address internal 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 transfer control of the contract to a newOwner.
         * @param newOwner The address to transfer ownership to.
         */
        function transferOwnership(address newOwner) onlyOwner public returns (bool) {
            require(newOwner != address(0x0));
            emit OwnershipTransferred(owner, newOwner);
            owner = newOwner;
    
            return true;
        }
    }
/**
 * @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 newOwner) onlyOwner public returns (bool) {
            require(newOwner != address(0x0));
            emit OwnershipTransferred(owner, newOwner);
            owner = newOwner;
    
            return true;
        }
/**
 * @dev Allows the current owner to transfer control of the contract to a newOwner.
 * @param newOwner The address to transfer ownership to.
 */