public async Task <IActionResult> SpecialBySlug(string slug)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            IPodcastModel specialModel = await _podcastService.GetSpecialBySlug(slug);

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

            return(Ok(specialModel));
        }