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