Given a string, write a function to check if it is a permutation of a palindrome.
A palindrome is a word or phrase that is the same forwards and backwards.
A permutation is a rearrangement of letters.
The palindrome does not need to be limited to just dictionary words.
EXAMPLE
Input: Tact Coa
Output: True
(permutations: "taco cat", "atco cta", etc.)