Update app.py

app.py

@@ -138,7 +138,7 @@ for message in st.session_state.messages:
         st.markdown(message['content'])
 
 if prompt := st.chat_input("Start talking with your student!"):
-    st.session_state.messages.append([{"role": name_to_role(m["name"]), "content": prompt} for m in st.session_state.messages])
+    st.session_state.messages.append({"role": "user", "content": prompt})
     with st.chat_message(name_to_role('tutor')):
         st.markdown(prompt)