Update app.py

app.py

@@ -9,7 +9,7 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def my_custom_tool(arg1: str, arg2: str) -> str:
+def count_letter(arg1: str, arg2: str) -> str:
     """Counts how many times a specific letter appears in a given text.
     Args:
         arg1: The input text to search.