[cli] Repeated substring problem

[luo zongle]

The commons cli project has repeatedly used substring here. Can I simplify it 
to one

Similar to the following


static String stripLeadingAndTrailingQuotes(String str) {
    final int length = str.length();
    String tmp;
    if (length > 1 && str.startsWith("\"") && str.endsWith("\"") && (tmp = 
str.substring(1, length - 1)).indexOf('"') == -1) {
        return tmp;
    }

    return str;
}



This is from before

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