X275: Recursion Programming Exercise: Check Palindrome

Write a recursive function named checkPalindrome that takes a string as input, and returns true if the string is a palindrome and false if it is not a palindrome. A string is a palindrome if it reads the same forwards or backwards.

Recall that str.charAt(a) will return the character at position a in str. str.substring(a) will return the substring of str from position a to the end of str, while str.substring(a, b) will return the substring of str starting at position a and continuing to (but not including) the character at position b.

Examples:

checkPalindrome("madam") -> true

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