Given a word, create a function which returns whether or not it's possible to create a palindrome by rearranging the letters in the word.
isPalindromePossible("rearcac") ➞ true
// You can make "racecar"
isPalindromePossible("suhbeusheff") ➞ true
// You can make "sfuehbheufs" (not a real word but still a palindrome)
isPalindromePossible("palindrome") ➞ false
// It's impossible
true.