01.check-in @Greeter

check-in(Greeter)

contract

pragma solidity 0.8.7;

contract Greeter {
    string greeting;

    constructor(string memory _greeting) public {
        greeting = _greeting;
    }

    function greet() public view returns (string memory) {
        return greeting;
    }

    function setGreeting(string memory _greeting) public {
        greeting = _greeting;
    }

    function isSolved() public view returns (bool) {
        string memory expected = "HelloChainFlag";
        return keccak256(abi.encodePacked(expected)) == keccak256(abi.encodePacked(greeting));
    }
}

analyses

To make isSolved() returns true, we should modify greeting to “HelloChainFlag”. So we call setGreeting() with “HelloChainFlag” and then it will be solved.