input: Write a python function to generate the first n numbers of the Fibonacci sequence.
  assert get_fibonacci_sequence(5) == [0, 1, 1, 2, 3]
  assert get_fibonacci_sequence(10) == [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
  assert get_fibonacci_sequence(1) == [0]
output: def get_fibonacci_sequence(n):
      if n <= 0:
          return []
      sequence = [0]
      if n > 1:
          sequence.append(1)
      while len(sequence) < n:
          sequence.append(sequence[-1] + sequence[-2])
      return sequence