I tried this problem some time ago but I could not succeed. I thought it was a skill issue. I'm back, definitely skill issue, but it doesn't take away from the fact that it's a horrendous problem.

nitpick: a minor typo Given a[N] empty string, return [an] empty string.

This is no where near 6th kyu. Rather 5th or even 4th.

This should DEFINETELY be at a higher rank. Very hard to pass all the tests.

Oh, thank you very much. Indeed, an empty string created such an error. I added a condition for an empty string and everything is fine!

Please provide language (JavaScript?) and your code, cause it is difficult to give you any advice without info. Maybe you should check edge cases - empty string?

I think this is more like a 5kyu question

"TypeError: Cannot read properties of null (reading 'length')" - i don't know how to deal with this anymore. All random tests the code passes perfectly.

Hey ! Seems like the 5th character on your result 'y' is your issue, it should equal 'v'.

'grfd [y] jposjb lka jhqrayaoliz' should equal 'grfd [v] jposjb lka jhqrayaoliz'

Hi, I can´t find the error!
'grfdyjposjb lka jhqrayaoliz' should equal
'grfdvjposjb lka jhqrayaoliz'

I wouldn't call it an issue, maybe a suggestion.

Anyway, it's fixed.

Thanks for approval

Ruby translation kumited -- please check and approve

Python