UserController.swift

struct User {
 let name: String   
}

class UserController {
    static let shared = UserController()
    var currentUser: User?
    
    private init() { 
        //don't forget to make this private
    }
    
    func signout() {
        print("singing out current session")
    }
}

class HomeViewController: UIViewController {
    private lazy var name = UILabel()

    override func viewDidLoad() {
        super.viewDidLoad()
        name.text = UserController.shared.currentUser?.name
    }

    private func handleSignOutButtonTap() {
        UserController.shared.signout()
    }
}