public function addSchedule(Request $request)
 {
     $shifts = Shifts::all();
     foreach ($shifts as $shift) {
         if (strtotime($shift->shift_from) == strtotime($request->input('shift_from'))) {
             if (strtotime($shift->shift_to) == strtotime($request->input('shift_to'))) {
                 $status = "Error: Schedule is already been in the database.";
                 break;
             } else {
                 $status = "Success!";
             }
         } else {
             $status = "Success!";
         }
     }
     if ($status == "Success!") {
         $result = Shifts::create(['shift_from' => $request->input('shift_from'), 'shift_to' => $request->input('shift_to')]);
         if ($result) {
             $status = "Success!";
         } else {
             $status = "Failed!";
         }
     }
     return redirect('/accounts')->with('status', $status);
 }