   }
 }
 
-class ContactPicker : UIViewController {
+class ContactPicker: UIViewController {
   var tableView = UITableView()
-  let dataSource = FriendsDataSource()
+  let dataSource = ContactDataSource()
   let search = UISearchBar()
 
   override func viewWillAppear(_ animated: Bool) {

}

extension ContactPicker {
  fileprivate func contact(for indexPath: IndexPath) -> String? {
    guard
      let key = dataSource.sortedContacts.keys.sorted()[safe: indexPath.section],

  }
}

extension ContactPicker: UITableViewDelegate {
  func numberOfSections(in tableView: UITableView) -> Int {
    return dataSource.sortedContacts.keys.count
  }
