input: Write a python function to remove punctuation from a string.
  assert remove_punctuation("Hello, world!") == "Hello world"
  assert remove_punctuation("Welcome to the jungle: it's fun!") == "Welcome to the jungle its fun"
  assert remove_punctuation("Goodbye; see you soon.") == "Goodbye see you soon"
output: def remove_punctuation(s):
      import string
      return ''.join(char for char in s if char not in string.punctuation)