class GiHubSearchViewController: UIViewController {
    var viewModel = GitHubSearchViewModel()
    var disposeBag = DisposeBag()
    @IBOutlet var searchBar: UISearchBar!
    @IBOutlet var tableView: UITableView!
    @IBOutlet var activityIndicator: UIActivityIndicatorView!
    @IBOutlet var errorLabel: UILabel!
    override func viewDidLoad() {
        super.viewDidLoad()
        configureViewModel()
        setupObservables()
    }
   func configureViewModel() {
        ...
    }
    func setupObservables() {
        ...
    }
}