fix Regular expression potision

app.py

@@ -59,8 +59,8 @@ async def chat(input_text, input_url):
     response = requests.post(endpoint, headers=headers, data=json_payload)
 
     response_msgs = extract_texts(response.text)
-    ''.join(response_msgs)
-    return response_msgs
+
+    return ''.join(response_msgs)
 
 with gr.Blocks() as iface:
     # UI