Given a matrix represented as a list of lists of integers, return its transpose. The transpose of a matrix swaps rows and columns: the element at row i, column j moves to row j, column i. The input matrix may not be square (rows and columns can differ in count). Return null for null input and an empty list for an empty matrix.
Examples:
Input: matrix = [[1,2,3],[4,5,6]]
Output: [[1,4],[2,5],[3,6]]
Explanation: 2x3 matrix becomes 3x2 after transpose
Input: matrix = [[1,2],[3,4],[5,6]]
Output: [[1,3,5],[2,4,6]]
Explanation: 3x2 matrix becomes 2x3 after transpose
Input: matrix = [[1]]
Output: [[1]]
Explanation: Single element matrix transposes to itself
Input: matrix = null
Output: null
Explanation: Null input returns null
Input: matrix = []
Output: []
Explanation: Empty matrix returns empty list
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