Rust 实现 ReAct 和主循环 
use std::{
    collections::HashMap,
    io::{self, Write},
};

use async_openai::types::chat::{
    ChatCompletionMessageToolCalls, ChatCompletionRequestAssistantMessage,
    ChatCompletionRequestAssistantMessageArgs, ChatCompletionRequestMessage,
    ChatCompletionRequestSystemMessage, ChatCompletionRequestToolMessage,
    ChatCompletionRequestUserMessage, ChatCompletionRespo...