input: Write a function to take two matrices, A and B, and return a matrix C where each element is the product of the corresponding elements of A and B. If the matrices do not have the same dimensions, return "Matrices are not compatible for element-wise multiplication."
  assert elementWiseProduct([[3, 4], [1, 2]], [[7, 5], [0, 1]])==[[21, 20], [0, 2]]
  assert elementWiseProduct([[3, 4], [1, 2]], [[7, 5, 1], [0, 1, 2]])=="Matrices are not compatible for element-wise multiplication."
  assert elementWiseProduct([], [])==[]
  assert elementWiseProduct([[5]], [[2]])==[[10]]
output: def elementWiseProduct(A, B):
      if len(A) != len(B) or any(len(rowA) != len(rowB) for rowA, rowB in zip(A, B)):
          return "Matrices are not compatible for element-wise multiplication."
      return [[A[i][j] * B[i][j] for j in range(len(A[0]))] for i in range(len(A))]