Update app.py

app.py

@@ -15,9 +15,9 @@ def my_custom_tool(country: str)-> str: #it's import to specify the return type
     Args:
         country (str): The country for which to search information.
     """
-    search = DuckSearch()
+    search_tool = DuckSearch()
     
-    result = search.run(f"What is the polulation of {country}?")
+    result = search_tool.run(f"What is the polulation of {country}?")
     return result
 
 @tool