Update app.py

app.py

@@ -43,9 +43,9 @@ option = st.sidebar.selectbox(
 
 placeholder = st.empty()
 
-sidebar.button('Remove Punctation', on_click=unpunct)
-sidebar.button('Remove Casing', on_click=uncase)
-sidebar.button('Remove Spaces', on_click=unspace)
+st.sidebar.button('Remove Punctation', on_click=unpunct)
+st.sidebar.button('Remove Casing', on_click=uncase)
+st.sidebar.button('Remove Spaces', on_click=unspace)
 
 with placeholder:
     text = st.text_area(f"Input text",max_chars=1000,height=140,key="textbox")