input: Write a python function to generate a random word of a specified length.
  assert len(generate_random_word(5)) == 5
  assert len(generate_random_word(10)) == 10
  assert len(generate_random_word(0)) == 0
output: import random
  import string
  
  def generate_random_word(length):
      return ''.join(random.choices(string.ascii_lowercase, k=length))