func getUser() {
        let accessToken = KeychainSwift().get("accessToken") ?? ""
        let headers: HTTPHeaders = ["Accept": "application/vnd.github.v3+json",
                                    "Authorization": "token \(accessToken)"]
        
        AF.request(githubApiURL+ApiPath.USER.rawValue,
                   method: .get,
                   parameters: [:],
                   headers: headers).responseJSON(completionHandler: { (response) in
            switch response.result {
            case .success(let json):
                print(json as! [String: Any])
            case .failure:
                print("")
            }
        })
    }

    struct User: Decodable {
        let login: String
        let name: String
    }

    func getUser() {
        let headers: HTTPHeaders = ["Accept": "application/vnd.github+json",
                                    "Authorization": "Bearer \(access_token!)"]
        
        AF.request("https://api.github.com/user",
                   method: .get, parameters: [:],
                   headers: headers).responseDecodable(of: User.self) { response in
            switch response.result {
            case .success(let user):
                self.userLogin = user.login
                self.userName = user.name
                self.getCommitData()
            case .failure(let error):
                print("Error: \(error.localizedDescription)")
            }
        }
    }

class LoginModel: ObservableObject {

    static let shared = LoginModel()

    @Published var code: String?
    @Published var access_token: String?
    @Published var userLogin: String?

    @Published var access_token: String? {
        didSet {
            UserDefaults.standard.setAccessToken(access_token ?? "")
        }
    }
    
    @Published var userName: String? {
        didSet {
            UserDefaults.standard.setUserName(userName ?? "")
        }
    }

    @Published var userLogin: String? {
        didSet {
            UserDefaults.standard.setUserLogin(userLogin ?? "")
        }
    }
    
    var results: [(String, String)] = []
    @Published var testCase:[String:Int] = [:]
    
    // UserDefaults로 선언된 변수를 사용하기 위한 init 부분
    init() {
        self.userLogin = UserDefaults.standard.getUserLogin()
        self.access_token = UserDefaults.standard.getAccessToken()
        self.userName = UserDefaults.standard.getUserName()
    }


// UserDefaults의 extension 부분 
    extension UserDefaults {
        private static let userLoginKey = "userLoginKey"

        func setUserLogin(_ login: String) {
            set(login, forKey: UserDefaults.userLoginKey)
        }

        func getUserLogin() -> String? {
            return string(forKey: UserDefaults.userLoginKey)
        }
    }

    extension UserDefaults {
        private static let userAcessToken = "acessToken"

        func setAccessToken(_ token: String) {
            set(token, forKey: UserDefaults.userAcessToken)
        }

        func getAccessToken() -> String? {
            return string(forKey: UserDefaults.userAcessToken)
        }
    }

    extension UserDefaults {
        private static let userNickname = "userNickname"

        func setUserName(_ name: String) {
            set(name, forKey: UserDefaults.userNickname)
        }

        func getUserName() -> String? {
            return string(forKey: UserDefaults.userNickname)
        }
    }