That's not a question, the function's name in Racket is literally palindrome?. That is a code block that should only be shown in Racket.

the function is called however you want

Good luck with passing the tests if you name the function however you want. Removed the code block and added a link to wikipedia about what a palindrome is, that should be enough.

I agree this needs a better description. Why not make a proper pseudo-code for 8 kyu bloody beginners?

is_palindrome("nope")    // should return False
is_palindrome("Yay")     // should return True

Also, I don't get the meaning of the question "In Racket, the function is called palindrome?". The answer is no, the function is called however you want and there are no pre-defined palindrome functions nor in Racket, Python or C++.

i cant resolve this problem, because i found solution.

then mark as question.

English is not native language for a huge amount of people on CW. If your vocabulary is lacking, that's your problem.

Nope, not an issue.

But maybe you need a better dictionnary? (or working out your google skills a bit more?) ;)

Cheers