input: Write a python function to perform matrix multiplication.
  assert matrixMultiplication([[3, 4], [1, 2]], [[7, 5], [0, 1]]) == [[21, 17], [7, 5]]
  assert matrixMultiplication([[1, 2, 3], [4, 5, 6]], [[7, 8], [9, 10], [11, 12]]) == [[58, 64], [139, 154]]
  assert matrixMultiplication([[1, 2], [3, 4]], [[2, 0], [1, 2]]) == [[4, 4], [10, 8]]
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