input: Write a python function to clean text data by removing special characters and translating to lowercase.
  assert clean_text("Hello, World!") == "hello world"
  assert clean_text("Python's great!!!") == "pythons great"
  assert clean_text("1234 @#$$%^&*()") == "1234"
output: def clean_text(text):
      import re
      text = re.sub(r'[^\w\s]', '', text)
      return text.lower()