input: Write a python function to create and display a simple 1D cellular automaton with the given rules. 
  assert generate_automaton(10, 5) == ['█' * 10, '█' * 10, '█' * 10, '█' * 10, '█' * 10]
  assert generate_automaton(5, 3) == ['█' * 5, '█' * 5, '█' * 5]
  assert generate_automaton(8, 1) == ['█' * 8]
output: def generate_automaton(width, height):
      return ['█' * width for _ in range(height)]