fix: avoid duplicated messages

app.py

@@ -62,7 +62,9 @@ def initialize_session_state():
 def on_click_callback():
     with st.spinner('Wait for it...'):
         with get_openai_callback() as cb:
-            human_prompt = st.session_state.human_prompt
+            human_prompt = st.session_state.human_prompt.strip()
+            if len(human_prompt) == 0:
+                return
             llm_response = st.session_state.conversation(human_prompt)
             st.session_state.history.append(Message("human", human_prompt))
             st.session_state.history.append(
@@ -80,8 +82,8 @@ initialize_session_state()
 
 with chat_column:
     chat_placeholder = st.container()
-    prompt_placeholder = st.form("chat-form")
-    information_placeholder = st.empty()
+    prompt_placeholder = st.form("chat-form", clear_on_submit=True)
+    information_placeholder = st.container()
 
     with chat_placeholder:
         for chat in st.session_state.history:
@@ -108,7 +110,6 @@ with chat_column:
         cols = st.columns((6, 1))
         cols[0].text_input(
             "Chat",
-            value="Hello Sorbobot !",
             label_visibility="collapsed",
             key="human_prompt",
         )