String index out of range in jva

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One approach would be to strip the non alpha characters out of the string. Then check if the string is the same as itself reversed (while upper case):

public static boolean isPalindrome(String palindrome) {
    StringBuilder sanitisedString = new StringBuilder();
    for(char c : palindrome.toCharArray()) {
        if(Character.isLetter(c)) {
            sanitisedString.append(c);
        }
    }
    return sanitisedString.toString().toUpperCase().equals(sanitisedString.reverse().toString().toUpperCase());
}

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