input: Write a function to generate a random number in the range [0, 10) and print it. The function should be named `generate_random_number`. If the input range is not specified, it should default to the range [0, 10).
  assert generate_random_number() >= 0
  assert generate_random_number() < 10
output: import random
  
  def generate_random_number(range_start=0, range_end=10):
      random_number = random.randint(range_start, range_end - 1)
      print(random_number)
      return random_number