The array-form of an integer num is an array representing its digits in left to right order.
num = 1321, the array form is [1,3,2,1].Given num, the array-form of an integer, and an integer k, return the array-form of the integer num + k.
1 <= num.length <= 10^40 <= num[i] <= 9num does not contain any leading zeros except for the zero itself.1 <= k <= 10^4num = [1,2,0,0], k = 34[1,2,3,4]num = [2,7,4], k = 181[4,5,5]num = [2,1,5], k = 806[1,0,2,1]