@IBAction func createAccountTapped(_ sender: Any) {
  if let email = emailTextField.text, let password =  /////////Thread 1
    passwordTextField.text {
    Auth.auth().createUser(withEmail: email, password:
      password, completion: { (user, error) in
      if let firebaseError = error {
        print(firebaseError.localizedDescription)
        return
      }
      print("success")
    })
  }
}


@IBAction func loginTapped(_ sender: Any) {
    if let email = emailTextField.text, let password =  ////// Thread1
      passwordTextField.text {
      Auth.auth().signIn(withEmail: email, password:
         password, completion: { (user, error) in
         if let firebaseError = error {
           print(firebaseError.localizedDescription)
            return
         }
         print("success")
       })
     }
   }