refactor: apply clippy lint

src/utils/message_response.rs

@@ -125,12 +125,10 @@ pub async fn handle_message_response(ctx: &serenity::Context, new_message: &sere
             }
 
             // only edit this thread if the message is the first one
-            if channel_id
+            if !channel_id
                 .messages(&ctx.http, |b| b.limit(1).before(new_message))
                 .await
-                .unwrap()
-                .len()
-                != 0
+                .unwrap().is_empty()
             {
                 return;
             }