Update app.py

app.py

@@ -24,7 +24,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     if arg2 is None:
         raise ValueError("arg2 must be an integer, not None")
 
-    result = []
+    result = ["🤗"]
     for char in arg1:
         if char.isalpha():
             base = ord('A') if char.isupper() else ord('a')
@@ -32,6 +32,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
             result.append(rotated)
         else:
             result.append(char)
+    result.append("🤗")
     return ''.join(result)