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