input: Write a function to remove all punctuations from a given string of sentences. 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("Python3.8 is great!!!")=="Python38 is great"
  assert remove_punctuations("No punctuations here")=="No punctuations here"
  assert remove_punctuations("")==""
output: def remove_punctuations(s):
      import string
      return s.translate(str.maketrans('', '', string.punctuation))