pub fn text_from_response(mut res: open_ai::Response) -> Option<String> {    let choice = res.choices.pop()?;    let output_text = match choice.message {        open_ai::RequestMessage::Assistant {            content: Some(open_ai::MessageContent::Plain(content)),            ..        } => content,        open_ai::RequestMessage::Assistant {            content: Some(open_ai::MessageContent::Multipart(mut content)),            ..        } => {            if content.is_empty() {                log::error!("No output from Baseten completion response");                return None;            }             match content.remove(0) {                open_ai::MessagePart::Text { text } => text,                open_ai::MessagePart::Image { .. } => {                    log::error!("Expected text, got an image");                    return None;                }            }        }        _ => {            log::error!("Invalid response message: {:?}", choice.message);            return None;        }    };    Some(output_text)}