contract Ownable {
 address 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.
  */
 function Ownable() 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) public onlyOwner {
   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 Ownable() public {
  owner = msg.sender;
}

/**
 * @dev The Ownable constructor sets the original `owner` of the contract to the sender
 * account.
 */