// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

// Defines a contract named `HelloWorld`.
contract HelloWorld {
   string public message;
   constructor(string memory initMessage) {
      message = initMessage;
   }
   function update(string memory newMessage) public {
      message = newMessage;
   }
   function viewMessage() public view returns(string memory) {
      return message;
   }
}