Update app.py

app.py

@@ -15,7 +15,7 @@ def md5_hash(arg1:str)-> str:
     Args:
         arg1: the string to be converted
     """
-    return hashlib.md5(arg1.encode('utf-8'))
+    return hashlib.md5(arg1.encode('utf-8')).hexdigest()
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: