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Kotlin - Extension Functions

Develop an extension function to check whether or not a string is a palindrome. A palindrome is a string, which reads the same backward as forward.

A first function should just check simple palindromes like "madam" or "racecar".

A second function should check sentence-length palindromes, where punctuation, lower/uppercase and word dividers do not matter. Examples include "A man, a plan, a canal, Panama!", "Was it a car or a cat I saw?" and "No 'x' in Nixon".

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