input: Write a python function to generate a list of 100 unique random numbers between 0 and 999.
  assert len(generate_random_numbers()) == 100
  assert len(set(generate_random_numbers())) == 100
  assert all(0 <= num < 1000 for num in generate_random_numbers())
output: import random
  
  def generate_random_numbers():
      return random.sample(range(1000), 100)