Fix syntax error

app.py

@@ -43,7 +43,7 @@ st.markdown(
 )
 
 # Define the placeholder globally (outside columns)
-if st.session_state && st.session_state.user_input:
+if st.session_state and st.session_state.user_input:
     placeholder = st.session_state.user_input
 else:
     placeholder = st.empty()