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class Solution {

public int[] plusOne(int[] digits) {

return addToDigit(digits, digits.length - 1);

}

private int[] addToDigit(int[] digits, int index) {

if (index == -1) {

int[] newDigits = new int[digits.length + 1];

newDigits[0] = 1;

for (int i = 0; i < digits.length; i++) {

newDigits[i + 1] = digits[i];

}

return newDigits;

}

if (digits[index] == 9) {

digits[index] = 0;

return addToDigit(digits, index - 1);

} else {

digits[index]++;

return digits;

}

}

}