PalindromeString.kt

fun main(args : Array<String>) {
   println("A man, a plan, a canal, Panama!".isContainsPalindrome())
}

fun String.isContainsPalindrome(): Boolean {

        // handel edge cases
        if(length == 0)
            return false

        if(length == 1)
            return (Character.isLetter(this[0]))


        var begin = 0
        var end = length-1
        var result = false

        while(begin <= end) {

            if(!Character.isLetter(this[begin])) {
                begin++
                continue
            }

            if(!Character.isLetter(this[end])){
                end--
                continue
            }

            if(this[begin].toLowerCase() != this[end].toLowerCase())
                return false

            begin++
            end--

            result = true
        }

        return result
    }