fix regenrate

app.py

@@ -63,11 +63,13 @@ st.title("Spelling checker for English learning")
 if st.sidebar.button("Regenerate"):
     update_frontend()
     user_word = None
+    st.session_state["text"] = ""
+
 
 if st.sidebar.button("Show"):
     update_audio()
 
-user_word = st.text_input("word", value="")
+user_word = st.text_input("word", value="", key="text")
 
 if st.sidebar.button("check spelling") or user_word:
     main_word  = get_main_word()