input: Write a function to remove all punctuations from a given string of sentences. Return the string with all punctuations removed. For the given input, "This is a sample string!", the output should be "This is a sample string".
  assert remove_punctuations("This is a sample string!")=="This is a sample string"
  assert remove_punctuations("Hello, World!")=="Hello World"
  assert remove_punctuations("Testing: 1, 2, 3.")=="Testing 1 2 3"
  assert remove_punctuations("")==""
  assert remove_punctuations("Punctuation! Exclamation? This is it.")=="Punctuation Exclamation This is it"
output: def remove_punctuations(s):
      import string
      return s.translate(str.maketrans('', '', string.punctuation))