Merge Two Sorted Lists

Take two already-sorted lists of integers and merge them into one sorted list. Handle null inputs by treating them as empty lists. Both input lists are sorted in ascending order, and the output should also be sorted in ascending order.

Examples:

Input: list1 = [1, 3, 5], list2 = [2, 4, 6] Output: [1, 2, 3, 4, 5, 6] Explanation: Merge two sorted lists into one sorted list Input: list1 = [1, 2, 3], list2 = [] Output: [1, 2, 3] Explanation: When one list is empty, return the other list Input: list1 = null, list2 = [1, 2] Output: [1, 2] Explanation: Null inputs are treated as empty lists Input: list1 = null, list2 = null Output: [] Explanation: Both null inputs result in an empty list Input: list1 = [1, 1, 2], list2 = [1, 3, 3] Output: [1, 1, 1, 2, 3, 3] Explanation: Duplicates are preserved in the merged list
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