public async Task <IHttpActionResult> Delete(int id)
        {
            try
            {
                var competition = await _repository.GetCompetitionByIdAsync(id);

                if (competition == null)
                {
                    return(NotFound());
                }
                _repository.DeleteCompetition(competition);
                if (await _repository.SaveChangesAsync())
                {
                    return(Ok());
                }
                else
                {
                    return(InternalServerError());
                }
            }
            catch (Exception ex)
            {
                return(InternalServerError(ex));
            }
        }