string update

app.py

@@ -15,7 +15,7 @@ def my_custom_tool(number1:int, number2:int)-> str:
         number2: the second argument
     """
     greatest_divisor = math.gcd_tool(number1,number2)
-    return "The greatest common divisor between {"number1"} and {"number2"} is {"greatest_divisor"}.
+    return f"The greatest common divisor between '{number1}' and '{number2}' is '{greatest_divisor}'.
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: