Flight log Solidity 짜보기

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.17;
 
contract flightLog{
    address owner;

    constructor(){
        owner = msg.sender;
    }

    // 로그 구조체
    struct Log{
        // 이륙 시간
        // 👇 hour : minute
        string takeoffTime;
        string landingTime;
        bool managerSign;
        bool studentSign;
        string flight;
        address studentAddress;
    }
    // 구조체 배열 선언
    Log[] logs;

    // 로깅 시작
    function logging(string memory _takeOffTime, string memory _flightNum) public {
        logs.push(Log(_takeOffTime,"",false,false,string.concat("HL-",_flightNum),msg.sender));
    }

    // 관리자의 서명
    function doManagerSign(uint _index) public{
        require(owner == msg.sender, "Your not manager!");
        logs[_index].managerSign = true;
    }

    // 교육생의 서명
    function doStudentSign(uint _index) public{
        require(logs[_index].studentAddress == msg.sender, "Your not student!");
        logs[_index].studentSign = true;
    }

    // 도착시간 업데이트
    function logLandingTime(uint _index, string memory _landingTime) public{
        logs[_index].landingTime = _landingTime;
    }

    // 로그 확인
    function getLog(uint _index) public view returns(Log memory){
        return logs[_index];
    }
}