Fixed errors and performance issue

src/commands/level.rs

@@ -571,7 +571,7 @@ pub async fn leaderboard(ctx: Context<'_>) -> Result<(), Error> {
                     // Fallback to HTTP
                     match ctx.http().get_user(user_id).await {
                         Ok(user) => {
-                            user_name = user.name;
+                            user_name = user.name.clone();
                             avatar_url = user.face();
                         }
                         Err(_) => {