public async Task <IActionResult> MeetupById(int id)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            MeetupModel meetupModel = await _meetupService.GetMeetupById(id);

            if (meetupModel == null)
            {
                return(NotFound());
            }

            return(Ok(meetupModel));
        }