Grokking 239

class Solution {
    public String maskPII(String S) {
        String s = S.toLowerCase();
        if (s.contains("@")) {
            int index = s.indexOf("@");
            String str = s.substring(0,index);
            return str.substring(0, 1)
                + "*****" + str.substring(str.length() - 1, str.length())
                + s.substring(index);
        } else {
            s = s.replace("+", "");
            s = s.replace("-", "");
            s = s.replace("(", "");
            s = s.replace(")", "");
            s = s.replace(" ", "");
            if (s.length() == 10)
                return "***-***-" + s.substring(6);
            else if(s.length() == 11)
                return "+*-***-***-" + s.substring(7);
            else if(s.length() == 12)
                return "+**-***-***-" + s.substring(8);
            else
                return "+***-***-***-" + s.substring(9);
        }
    }
}