Description: Given an array of integers of any length, return an array that has 1 added to the value represented by the array. the array can't be empty only non-negative, single digit integers are allowed Return nil (or your language's equivalent) for invalid inputs. Examples For example the array [2, 3, 9] equals 239, adding one would return the array [2, 4, 0]. [4, 3, 2, 5] would return [4, 3,..