input: Write a function to generate a random number between 0 and 9 that is divisible by 3.
  assert generate_random_divisible_number() in [0, 3, 6, 9]
  assert generate_random_divisible_number() in [0, 3, 6, 9]
  assert generate_random_divisible_number() in [0, 3, 6, 9]
output: import random
  
  def generate_random_divisible_number():
      return random.choice([0, 3, 6, 9])