Fix username preprocessing in my_insta_analizer

app.py

@@ -33,7 +33,6 @@ async def my_insta_analizer(username:str)-> str: #it's import to specify the ret
     Args:
         username: The Instagram username of the person whose profile needs to be analyzed. Always strats from "@". Example: @irusvvirus.
     """
-    username = username[1:]
     DATA_ROOT = f"data/{username}"
     MAX_SIZE = (144, 192)
     TOP_K_POSTS = 12