Given an integer n, return the product of its digits. Ignore the sign of the number (use its absolute value). If any digit is zero, the product is zero.
Examples:
Input: n = 234
Output: 24
Explanation: 2 * 3 * 4 = 24
Input: n = 10
Output: 0
Explanation: 1 * 0 = 0
Input: n = 5
Output: 5
Explanation: A single digit number returns itself
Input: n = 999
Output: 729
Explanation: 9 * 9 * 9 = 729
Input: n = -25
Output: 10
Explanation: Use the absolute value, so 2 * 5 = 10
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