input: Write a python function to generate a 5x5 matrix with random integers between 1 and 100 using numpy.
  assert random_matrix().shape == (5, 5)
  assert (random_matrix() >= 1).all() and (random_matrix() < 100).all()
  assert isinstance(random_matrix(), np.ndarray)
output: def random_matrix():
      import numpy as np
      return np.random.randint(1, 101, size=(5, 5))