input: Write a function to remove punctuation from a string and replace it with a space.
  assert remove_punctuation("Hello, world!") == "Hello  world "
  assert remove_punctuation("Python's amazing, isn't it?") == "Python s amazing  isn t it "
  assert remove_punctuation("No punctuation here") == "No punctuation here"
output: def remove_punctuation(s):
      import string
      return ''.join(' ' if char in string.punctuation else char for char in s)