Remove hidden values within string

Question

I tried removing the Unicode Whitespaces in the string using words[len].Trim() but still there's still an extra character.

Every letter represents the coordinate of where the letter is. As you can see there's an extra coordinate/value and it is always located at the end of the string. (dont mind the '# tries') Can you help me Identify what is the extra invisible unicode and what to do in order for it to be removed?

private string[] FisherShuffle(string[] words) {
    int len = words.Length;
    while(len > 0) {
        float index = Mathf.Floor(Random.Range(0f, 1f) * len);
        len--;
        var temp = words[len].Trim();
        words[len] = words[(int)index];
        words[(int)index] = temp;
    }
    return words;
}

UPDATE: I have found out that the ASCII value is 13. I also have tried using TrimEnd('\n','\n') & words[len].TrimEnd(System.Environment.NewLine.ToCharArray()) to no avail

private string[] FisherShuffle(string[] words) {
    int len = words.Length;
    int index;
    string temp;
    while(len > 0) {
        index = (int) Mathf.Floor(Random.Range(0f, len));
        len--;
        //temp = words[len].TrimEnd('\n','\r');
        temp = words[len].TrimEnd(System.Environment.NewLine.ToCharArray());
        words[len] = words[index];
        words[index] = temp;
    }
    return words;
}

Answer 1

The documentation for String.Trim() tells us

White-space characters are defined by the Unicode standard. The Trim() method removes any leading and trailing characters that produce a return value of true when they are passed to the Char.IsWhiteSpace method.

One option is to use the overload String.Trim(Char[]) to specify characters that you aren't expecting. To debug, you could iterate over the string printing each character and the corresponding result of Char.IsWhiteSpace.

Please consider refactor as well.

private string[] FisherShuffle(string[] words) {
    int len = words.Length;
    int i;
    string tmp;

    while(len > 0) {
        i = (int) Random.Range(0, (float) len);
        len--;

        tmp = words[len].Trim();
        words[len] = words[i];
        words[i] = tmp;
    }
    return words;
}