Update app.py

app.py

@@ -146,7 +146,7 @@ async def c_cmp(payload: Payload):
             yield "data: " + json.dumps(
                 make_chunk_obj(i, delta, None)
             ) + "\n\n"
-            text = item
+            text += delta
 
         yield "data: " + json.dumps(make_chunk_obj(i, "", "stop")) + "\n\n"
         yield "data: [END]" + "\n\n"