I still have a lot of trouble using OpenAI function-calling API (and json mode) for returning source code. I have trouble when the source code has quotes, which

I still have a lot of trouble using OpenAI function-calling API (and json mode) for returning source code. I have trouble when the source code has quotes, which is pretty common. The result may be missing quotes, have incorrectly escaped quotes, or use of the wrong type of quotes at the JSON object level.