input: Write a python function to remove punctuation from a given string.
  assert remove_punctuation("Hello, world!") == "Hello world"
  assert remove_punctuation("Good morning! How are you?") == "Good morning How are you"
  assert remove_punctuation("This string contains , a comma, and a % symbol.") == "This string contains  a comma and a  symbol"
output: def remove_punctuation(s):
      import string
      return s.translate(str.maketrans('', '', string.punctuation))