Marranito.sol

pragma solidity >=0.4.22 <0.6.0;

contract Marranito {
    
    address owner;
    
    constructor() public {
        owner = msg.sender;
    }
    
    modifier onlyOwner() {
        require(msg.sender == owner, "This is not the account I was expecting");
        _;
    }
    
    function transfer(address _to) public onlyOwner {
        owner = _to;
    }
    
    function withdraw() private onlyOwner {
        msg.sender.transfer(address(this).balance);
    }
    
    function() external payable {
        if(msg.value == 0) {
            withdraw();
        }
    }
}