public static Character FirstNonRepeated(String string) {
        int[] counter = new int[128];
        for (int i = 0; i < string.length(); i++) {
            char ch = string.charAt(i);
            counter[ch]++;;
        }
        for (int i = 0; i < string.length(); i++) {
            char ch = string.charAt(i);
            if(counter[ch] == 1)
                return ch;
        }
        return null;
    }