exchange 添加 clone

standard/src/binance_swap.rs

@@ -1,6 +1,7 @@
 use std::collections::BTreeMap;
 use std::io::{Error, ErrorKind};
 use std::result::Result;
+
 use async_trait::async_trait;
 use rust_decimal::Decimal;
 use rust_decimal_macros::dec;

standard/src/exchange.rs

@@ -50,7 +50,7 @@ pub enum ExchangeEnum {
 /// params.insert("access_key".to_string(), "your_access_key".to_string());
 /// params.insert("access_key".to_string(), "your_secret_key".to_string());
 /// let exchange = Exchange::new(ExchangeEnum::BinanceSwap, "BTC_USDT".to_string(), false, params);
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct Exchange;
 
 impl Exchange {