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

            IPodcastModel podcastModel = await _podcastService.GetPodcastBySlug(slug);

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

            return(Ok(podcastModel));
        }