🚧 replace bing with duckduckgo

app.py

@@ -10,8 +10,8 @@ from smolagents import (
     PromptTemplates,
     FinalAnswerTool,
     HfApiModel,
+    DuckDuckGoSearchTool,
     VisitWebpageTool,
-    WebSearchTool,
     WikipediaSearchTool,
 )
 
@@ -21,7 +21,7 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
 
 final_answer = FinalAnswerTool()
-web_search = WebSearchTool(engine="bing")
+web_search = DuckDuckGoSearchTool()
 visit_webpage = VisitWebpageTool()
 wiki_search = WikipediaSearchTool()