pragma solidity ^0.4.24;

contract NameRegistry {
    string public name;
    address public owner;
    mapping(address => string) public names;

    constructor () public {
        owner = msg.sender;
    }

    function sayHello() public pure returns (string) {
        return 'Hello Ethereum';
    }

    function setMyName(string _name) public {
        names[msg.sender] = _name;
    }

    function getMyName() public view returns (string) {
        return names[msg.sender];
    }

}