diff --git a/app/tool/web_search.py b/app/tool/web_search.py
index 3647883..8b80e46 100644
--- a/app/tool/web_search.py
+++ b/app/tool/web_search.py
@@ -6,7 +6,7 @@ from tenacity import retry, stop_after_attempt, wait_exponential
 from app.config import config
 from app.tool.base import BaseTool
 from app.tool.search import (
-    BaiduSearchEngine, 
+    BaiduSearchEngine,
     BingSearchEngine,
     DuckDuckGoSearchEngine,
     GoogleSearchEngine,