make a generated URL to look like a valid URL

src/url-shortener/url-shortener.service.ts

@@ -18,7 +18,7 @@ export class UrlShortenerService {
     if(!isValid) {
       throw new Error('URL is invalid');
     }
-    let shortUrl = shortid.generate();
+    let shortUrl = "tiny." + shortid.generate() + ".com";
     this.urlMap.set(shortUrl, originalUrl);
     return shortUrl
   }