public String function shuffle(required String s)
{
    // get string as array
    var characters = listToArray(arguments.s, "");

    // initialize end result
    var result = [];

    while(arrayLen(characters) != 0){
        // get random index within the remaining length of the characters
        var index = randRange(1, arrayLen(characters));
        arrayAppend(result, characters[index]);
        arrayDeleteAt(characters, index);
    }

    return arrayToList(result, "");
}