class Scratch {
    public static void main(String[] args) {
        int[] multipliers = {4,3,6,7,8,9,2,3,7,2,3,6,5,4};
 
        String input = "VG0999999099999901012023099999999V99100012999999".strip();
		if (args.length > 0) {
			input = args[0].strip();
		}
        System.out.println(input);
 
        // Strip all non-digit characters and convert to numeric array
        int[] digits = input.substring(2)
                .replaceAll("[^0-9]", "")
                .chars()
                .map(operand -> operand - '0')
                .toArray();
 
        int[] shiftedMultipliers = new int[multipliers.length];
        for (int i = 0; i < multipliers.length; i++) {
            shiftedMultipliers[i] = multipliers[(digits.length - 1 - i) % multipliers.length];
        }
 
        int parityDigit = 0;
        for (int i = 0 ; i < digits.length; i++) {
            parityDigit -= digits[i] * shiftedMultipliers[i % shiftedMultipliers.length];
 
        }
 
        parityDigit = Math.floorMod(parityDigit, 10);
        System.out.println(input + parityDigit);
    }
}

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VG 0999999 0999999 01012023 099999999V99 1 00 0 1 2999994