input: Write a python function to generate a random number within a specified range and return it.
  assert generate_random(1, 10) in range(1, 11)
  assert generate_random(10, 20) in range(10, 21)
  assert generate_random(100, 200) in range(100, 201)
output: import random
  
  def generate_random(start, end):
      return random.randint(start, end)