Update app.py

app.py

@@ -16,7 +16,7 @@ def convert_dog_age_to_human_age(name_of_pet: str, dog_age: int) -> int:
     """
     human_age = dog_age * 7;
 
-    return f"{name_of_pet}'s age in human years is '{human_age}."
+    return f"{name_of_pet}'s age in human years is {human_age}."
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: