input: Write a function that removes all punctuations from a given string. The function should return the string with all punctuation marks removed. If the input string is empty, the function should return an empty 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("")==""
  assert remove_punctuations("?!")==""
output: def remove_punctuations(s):
      import string
      return s.translate(str.maketrans('', '', string.punctuation))