input: Write a function to perform matrix multiplication on two given matrices and return the resulting matrix. The function should work for any valid matrices A and B, where the number of columns in A matches the number of rows in B. If the multiplication is not possible, the function should return an empty list.
  def matrix_multiplication(A, B):  
      rows_A = len(A)  
      cols_A = len(A[0])  
      rows_B = len(B)  
      cols_B = len(B[0])  
      if cols_A != rows_B:  
          return []  
      result = [[0 for i in range(cols_B)] for j in range(rows_A)]  
      for i in range(rows_A): 
          for j in range(cols_B): 
              for k in range(cols_A): 
                  result[i][j] += A[i][k] * B[k][j] 
      return result
  
  assert matrix_multiplication([[1, 2], [3, 4]], [[5, 6], [7, 8]])==[[19, 22], [43, 50]]
  assert matrix_multiplication([[1, 2, 3], [4, 5, 6]], [[7, 8], [9, 10], [11, 12]])==[[58, 64], [139, 154]]
  assert matrix_multiplication([[1, 2], [3, 4]], [[5, 6, 7], [8, 9, 10]])==[19, 22, 25], [43, 50, 57]]
  assert matrix_multiplication([[1, 2], [3, 4]], [[5, 6], [7, 8], [9, 10]])==[]
  assert matrix_multiplication([], [])==[]
output: def matrix_multiplication(A, B):  
      rows_A = len(A)  
      cols_A = len(A[0]) if A else 0  
      rows_B = len(B)  
      cols_B = len(B[0]) if B else 0  
      if cols_A != rows_B:  
          return []  
      result = [[0 for i in range(cols_B)] for j in range(rows_A)]  
      for i in range(rows_A): 
          for j in range(cols_B): 
              for k in range(cols_A): 
                  result[i][j] += A[i][k] * B[k][j] 
      return result