3754. Concatenate Non-Zero Digits and Multiply by Sum I

You are given an integer n. Form a new integer x by concatenating all the non-zero digits of n in their original order. If there are no non-zero digits, x = 0. Let sum be the sum of digits in x. Return an integer representing the value of x * sum. Example 1: Input: n = 10203004 Output: 12340 Explanation: - The non-zero digits are 1, 2, 3, and 4. Thus, x = 1234. - The sum of digits is su