//SPDX-License-Identifier: Unlicense pragma solidity ^0.8.0; import "hardhat/console.sol"; contract Greeter { event newGreeting(string greeting, address sender); string private greeting; constructor(string memory _greet) { console.log("Deploying a Greeter with greeting:", _greet); greeting = _greet; } function greet() public view returns (string memory) { return greeting; } function setGreeting(string memory _greeting) external { console.log("Changing greeting from '%s' to '%s'", greeting, _greeting); greeting = _greeting; emit newGreeting(_greeting, msg.sender); } } 0.4.18