diff --git a/src/coex/exchange_team.rs b/src/coex/exchange_team.rs
index 3acf7d2..d391f9c 100644
--- a/src/coex/exchange_team.rs
+++ b/src/coex/exchange_team.rs
@@ -117,20 +117,16 @@ pub async fn buy_coin(
     exchange_info_vec: &Vec<ExchangeInfo>,
     trade_fee_vec: &Vec<TradeFee>,
 ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
-    // check conditions for buying
     let mut suggested_coin = get_suggested_coin_list().await;
-    let mut delete_condition = String::from("WHERE ");
-    let mut is_exist_delete_symbol: bool = false;
 
     if !suggested_coin.is_empty() {
-        // && (signal_decision.first().unwrap().decision == "KEEP" || signal_decision.first().unwrap().decision == "UP") {
-        let unit_trade_usdt = get_unit_trade_usdt().await;
         let server_epoch = server_epoch().await;
         let mut filtered_suggested_coin_vec: Vec<&SuggestedCoin> = Vec::new();
-
+        let mut is_exist_delete_symbol: bool = false;
+        let mut delete_condition = String::from("WHERE ");
+        
         // filtering symbols to buy
         for element in &suggested_coin {
-
             if element.already_buy == 0
                 && server_epoch - element.registered_server_epoch <= 600_000
             // 600_000 (600 secs = 10 mins)
@@ -144,11 +140,12 @@ pub async fn buy_coin(
                 is_exist_delete_symbol = true;
             }
         }
-
+        
         set_is_tradable().await;
         let mut is_tradable = get_is_tradable().await;
 
         if is_tradable == true && !filtered_suggested_coin_vec.is_empty() {
+            let unit_trade_usdt = get_unit_trade_usdt().await;
             let available_usdt = get_available_usdt().await;
             let vec_len = Decimal::new(filtered_suggested_coin_vec.len() as i64, 0);
             let mut used_usdt = Decimal::new(0, 8);