input: Write a function to remove all punctuations from a given string of sentences. Use the string.punctuation constant to identify and remove punctuations. The function should return the cleaned string without any punctuations.
  assert remove_punctuations("This is a sample string!")=="This is a sample string"
  assert remove_punctuations("Hello, World!")=="Hello World"
  assert remove_punctuations("Python3.9 is awesome.")=="Python39 is awesome"
  assert remove_punctuations("")==""
output: def remove_punctuations(s):
      import string
      return ''.join(char for char in s if char not in string.punctuation)