preloaded is preloaded with user solution and should contain only something useful to solution (e.g. a list of chemical elements in a kata about chemistry).

Reference solution, test case generator and all things related to tests should go in test section.

Is it working now?

Yeah it didn't let me delete, but thank you

if you open up the editor again there might be a delete button. It's been a long time since I created a kata, but I remember there was a bug at one point where it wasn't possible to delete your own kata. Hopefully that's resolved.

Can u explain, I'm not quite understand. How can I fix it

I still want to delete it though, is there any way I can do that?

I'm not sure you can delete katas. It's in a draft state now which is fine. Nobody else will be able to to submit solutions.

This is just a demo cause it is my first time, I'll delete this. Thank you for your comment

There is a working solution in preloaded.

This should not pass.

Submission tests import create_palidrome and generate from solution.