Is the word a palindrome

Write a function isPalindromeWord(word) that returns true when word is a palindrome and false otherwise.

• word has only Latin letters, from 1 to 1000 of them.
• The check is case insensitive: 'Racecar', 'NOON' and 'abBA' are palindromes.
• A word of one letter is a palindrome.
• Return true or false.

Tip: at the whiteboard there was no IDE. Try two indexes, one from each end of the word, that move toward each other (two pointers). The tests check only the result.