trim entered name

frontend/src/components/Lobby.tsx

@@ -17,6 +17,7 @@ export function Lobby(props: {
 }) {
     const [submitted, setSubmitted] = useState<boolean>(false);
     const submitName = async (name: string) => {
+        name = name.trim();
         if (name.length > 0) {
             writeToUrl(name);
             setSubmitted(true);