override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
        let button = UIButton(type: .system)
        button.setTitle("Button", for: .normal)

        button.addTarget(self,
                         action: #selector(didAuthorize),
                         for: .touchUpInside)
        button.centerYAnchor.constraint(equalTo: view.centerYAnchor)
        NSLayoutConstraint.activate([
            button.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            button.centerYAnchor.constraint(equalTo: view.centerYAnchor)
            ])

    }

    @objc
    private func didAuthorize() {
        socialService.authorize {
            self.socialService.getFriends { response in
                //P
                switch response {
                case let .success(friends):
                    print(friends)
                case let .failure(error):
                    print(error)
                }
            }
            print($0)
        }
    }