Update app.py

app.py

@@ -17,7 +17,7 @@ def my_custom_tool(country: str)-> str: #it's import to specify the return type
     """
     search = DuckSearch()
     
-    result = search_tool.run(f"What is the polulation of {country}?")
+    result = search.run(f"What is the polulation of {country}?")
     print(result)
     return result