input: Write a function to generate an array of random numbers in Python using numpy. The function should take an integer size as input and return an array of random integers with values between 0 and 99.
  
  assert generate_random_array(10) is not None
  assert len(generate_random_array(5)) == 5
  assert all(0 <= x < 100 for x in generate_random_array(15))
output: import numpy as np
  
  def generate_random_array(size):
      return np.random.randint(0, 100, size)