public async Task <IActionResult> Index(int?id)
        {
            var categories = await _context.Category.ToListAsync();

            ViewData["categories"] = categories;

            var search = "TOATE";

            if (id != null)
            {
                search = categories.First(it => it.Id == id).Name;
            }
            ViewData["search"] = search;

            var details = await _context.DetailsRobotics(id);

            ViewData["allRobo"] = details;
            return(View());
        }