input: 
  def elementwiseMultiplication(A, B):
      """Multiply corresponding elements of matrices A and B to produce matrix C.
      >>> elementwiseMultiplication([[3, 4], [1, 2]], [[7, 5], [0, 1]])
      [[21, 20], [0, 2]]
      """
      if len(A) != len(B) or len(A[0]) != len(B[0]):
          return "Matrices must have the same dimensions"
  
      C = [[A[i][j] * B[i][j] for j in range(len(A[0]))] for i in range(len(A))]
  
      return C
  
output:     return C