I can do it, I just looked over here to see if "only for study group" was name of challenge or if it was only for your study group. the nice character caught me eye. Ill go ahead and leave it alone though as not to tip off the students.

It's not a real kata, seems to be a fiddle, the solution is already written to complete it just look at on return value and search.

Please don't use Chinese

Alternatively, don't publish it as a beta kata.

You can unpublish it and then it'll become a draft, which is essentially an unlisted kata that only people with the link can access to.

Please write your kata in English.

It might be intended for your study group only, all of us see it. Some of us might want to solve it. Some of us might have valuable insights. Don't short us, don't short yourself, don't short your study group.