public ActionResult GenerateLink(LinkModel model)
 {
     if (ModelState.IsValid) {
         return RedirectToAction("Index", new LinkModel{ HappyLink = _links.GetHappyLink(model.OriginalLink)});
     }
     return RedirectToAction("Index");
 }
 public ActionResult Index(LinkModel model)
 {
     if(model == null) model = new LinkModel();
     ModelState.Clear();
     return View("Index", model);
 }