Create code in solidity to download data files, create smart contract and download in the storj

pragma solidity ^0.4.16;

import "./Ownable.sol";


contract MyContract is Ownable {
    
    string public message;
    
    function MyContract() public {
        message = "Hello world!";
    }
    
    function setMessage(string _message) public onlyOwner  {
        
        message = _message;
        
    }
    
}