file renaming issues fixed

app.py

@@ -1,5 +1,5 @@
 import gradio as gr
-import app as app
+import functions as functions
 
 # pre-defined questions
 questions = [
@@ -60,7 +60,7 @@ with gr.Blocks(css="""#chatbot { font-size: 14px; min-height: 1200; }""") as dem
   
     # Bind the click event of the button to the question_answer function
     btn.click(
-        app.question_answer,
+        functions.question_answer,
         inputs=[chatbot, url, files, question, openAI_key, model],
         outputs=[chatbot],
     )