I think overall the kata is rather fine as far as execution goes, it is just that the concept and idea behind it isn't new or unique, and overall isn't super interesting. I get that it is for beginners, but basic conditions, and string splitting and filtering has already been done a lot.

So my advice would be to really think of a fun, unique idea, and try again. (Often that means aiming for a bit of a harder kata). I doubt this one will make it through beta.