input: Write a python function to remove punctuations from a given string.
  assert remove_punctuations("Hello, World!") == "Hello World"
  assert remove_punctuations("Good morning! Have a nice day.") == "Good morning Have a nice day"
  assert remove_punctuations("This is a test...") == "This is a test"
  assert remove_punctuations("Coding in Python: fun and easy!") == "Coding in Python fun and easy"
output: def remove_punctuations(s):
      import string
      return ''.join(char for char in s if char not in string.punctuation)