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Write an efficient function that checks whether any permutation of an input string is a palindrome.
You can assume the input string only contains lowercase letters.
"civic" should return YES
"ivicc" should return YES
"civil" should return NO
"livci" should return NO
"But 'ivicc' isn't a palindrome!"
If you had this thought, read the question again carefully. We're asking if any permutation of the string is a palindrome. Spend some extra time ensuring you fully understand the question before starting. Jumping in with a flawed understanding of the problem doesn't look good in an interview.
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