input: Write a python function to perform matrix multiplication.
  assert matrixMultiplication([[1, 2], [3, 4]], [[2, 0], [1, 2]]) == [[4, 4], [10, 8]]
  assert matrixMultiplication([[1, 0], [0, 1]], [[5, 6], [7, 8]]) == [[5, 6], [7, 8]]
  assert matrixMultiplication([[2, 3], [4, 5]], [[1, 2], [3, 4]]) == [[11, 16], [19, 28]]
output: def matrixMultiplication(A, B):
      result = [[0 for _ in range(len(B[0]))] for _ in range(len(A))]
      for i in range(len(A)):
          for j in range(len(B[0])):
              for k in range(len(B)):
                  result[i][j] += A[i][k] * B[k][j]
      return result