input: Write a function that takes in a string of sentences and removes all the punctuations. The function should return the cleaned string without any punctuations.
  
  import string
  
  def remove_punctuations(s):
      return s.translate(str.maketrans('', '', string.punctuation))
  
  assert remove_punctuations("This is a sample string!") == "This is a sample string"
  assert remove_punctuations("Hello, World!") == "Hello World"
  assert remove_punctuations("Python3.6") == "Python36"
  assert remove_punctuations("This-is-a-test.") == "Thisisatest"
  assert remove_punctuations("") == ""
output: import string
  
  def remove_punctuations(s):
      return s.translate(str.maketrans('', '', string.punctuation))