input: Write a function to generate a random number between the given input numbers. The function should take two parameters, start and stop, and return a random integer within this range (inclusive).
  assert random_num(0, 10)==1
  assert random_num(5, 15)==8
  assert random_num(-5, 5)==0
  assert random_num(100, 200)==150
  assert random_num(0, 0)==0
output: import random
  
  def random_num(start, stop):
      return random.randint(start, stop)