Pocket FM Round 1 LLD Code

import UIKit
import Foundation

// Design login view model whch can adopt any type of login (login via Facebook, Gmail, Apple etc)
// We will have 3 different view controllers - and we need only 1 single view model for all 3

protocol LoginManager {
    func signIn()
    func signOut()
}

final class FacebookLoginManager: LoginManager {
    func signIn() {
    }

    func signOut() {
    }
}

final class GmailLoginManager: LoginManager {
    func signIn() {
    }

    func signOut() {
    }
}

final class AppleLoginManager: LoginManager {
    func signIn() {
    }

    func signOut() {
    }
}

final class LoginViewModel {
    private var loginManager: LoginManager

    init(loginManager: LoginManager) {
        self.loginManager = loginManager
    }

    func signIn() {
        loginManager.signIn()
    }

    func signOut() {
        loginManager.signOut()
    }
}

func printFunc() {
    defer {
        print("A")
    }
    defer {
        print("B")
    }
    defer {
        print("C")
    }
}