Clean Palindrome Check

A phrase may contain spaces, commas, and mixed letter case, but those are just noise when checking a palindrome. Given a string s, consider only letters and digits. Ignore case, so A and a count as the same character. Return True if the cleaned string reads the same from left to right and right to left; otherwise, return False.

Примеры

Ввод

"A man, a plan, a canal: Panama"

Вывод

True

Ввод

"race a car"

Вывод

False

Ввод

" "

Вывод

True

Нужно реализовать

def is_palindrome(s):

Clean Palindrome Check

Примеры

Нужно реализовать

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