public async Task <ActionResult> Delete(int id)
        {
            var circleTopicFromRepo = await _repo.GetCircleTopic(id);

            if (circleTopicFromRepo == null)
            {
                return(NotFound());
            }
            if (!await MatchAppUserWithToken((int)circleTopicFromRepo.AppUserId))
            {
                return(Unauthorized());
            }

            var allTopicPhotos = await _repo.GetAllCommentPhotosForCircleTopic(circleTopicFromRepo.Id);

            _repo.Delete(circleTopicFromRepo);
            await _repo.SaveAll();

            if (circleTopicFromRepo.PhotoId != null)
            {
                _repo.Delete(circleTopicFromRepo.Photo);
                var task = this._imageFileStorageManager.DeleteImageFileAsync(circleTopicFromRepo.Photo);
            }

            foreach (var topicPhoto in allTopicPhotos)
            {
                _repo.Delete(topicPhoto);
                var task = this._imageFileStorageManager.DeleteImageFileAsync(topicPhoto);
            }

            await _repo.SaveAll();

            return(Ok());
        }