input: Write a python function to generate a unique ID based on a string using uuid.uuid3.
  assert generate_unique_id("example.com") == uuid.UUID("9073926b-929f-31c2-abc9-fad77ae3e8d9")
  assert generate_unique_id("python.org") == uuid.UUID("6fa459ea-ee8a-3ca4-894e-db77e160355e")
  assert generate_unique_id("test_string") == uuid.UUID("c39f6b92-927d-3cb1-8a6e-34dfaa7a1d7f")
output: import uuid
  
  def generate_unique_id(input_string):
      return uuid.uuid3(uuid.NAMESPACE_DNS, input_string)