Update app.py

app.py

@@ -64,7 +64,7 @@ def messages_for_python(python):
 ### cpp is a file extension of C++ code
 def write_output(cpp: str):
     code = cpp.replace("```cpp", "").replace("```", "")
-    with open(f"optimized-{current_time}.cpp", "w") as f:
+    with open(f"/tmp/optimized-{current_time}.cpp", "w") as f:
         f.write(code)
 
 def convert_and_optimize_code_with_openai(python):