input: Write a function to remove all punctuations from a given string of sentences. If the string is empty, return an empty string.
  def remove_punctuations(s):
      import string
      if s == "":
          return ""
      return s.translate(str.maketrans('', '', string.punctuation))
  assert remove_punctuations("This is a sample string!")=="This is a sample string"
  assert remove_punctuations("Hello, world!")=="Hello world"
  assert remove_punctuations("Python is fun!")=="Python is fun"
  assert remove_punctuations("No punctuations here")=="No punctuations here"
  assert remove_punctuations("")==""
output: def remove_punctuations(s):
      import string
      if s == "":
          return ""
      return s.translate(str.maketrans('', '', string.punctuation))