public function loginDoctor(Request $request)
 {
     try {
         $doctor = new Doctor();
         $doctor->strUsername = $request->strUsername;
         $doctor->strPassword = $request->strPassword;
         $status = $doctor->login();
         if ($status === "success") {
             session()->put('doctorId', $doctor->getIdByUsername());
             return redirect()->action('PatientController@getAllPatient');
         } else {
             return view('landing');
         }
     } catch (Exception $e) {
         dd($e);
     }
 }