Update app.py

app.py

@@ -153,7 +153,7 @@ if uploaded_files and api_key:
                                     print(f"DataFrame: {df}")
                                     if not df.empty:
                                         st.dataframe(df)
-                                        xcel_buffer = BytesIO()
+                                        excel_buffer = BytesIO()
                                         df.to_excel(excel_buffer, index=False)
                                         excel_data = excel_buffer.getvalue()