@JsonIgnore
	public <T> Mono<T> getFunctionResult() {
		if (isEmpty())
			return Mono.empty();
		return Flux.fromIterable(choices)
			.filter(choice -> choice.getMessage() != null && choice.getMessage().getToolCalls() != null)
			.last()
			.flatMap(choice -> choice.getMessage().getFunctionResult());
	}
get reply text from messages' content
@return reply text
src/main/java/org/mvnsearch/chatgpt/model/completion/chat/ChatCompletionResponse.java