input: Write a python function to convert text into numerical features where the word 'happy' is represented by 1 and all other words by 0.
  assert np.array_equal(get_features("I am happy"), np.array([0, 0, 1]))
  assert np.array_equal(get_features("happy happy joy joy"), np.array([1, 1, 0, 0]))
  assert np.array_equal(get_features("sad and unhappy"), np.array([0, 0, 0]))
output: def get_features(text):
      words = text.split()
      return np.array([1 if word == 'happy' else 0 for word in words])