Update app.py

app.py

@@ -25,7 +25,7 @@ def calculator_tool(expression: str)-> str: # Returns a string result
         if response.status_code == 200:
             return f"Result: {response.json()}"
         else:
-            retunr f"Error: {response.text}"
+            return f"Error: {response.text}"
     except Exception as e:
         return f"Error: {str(e)}"