input: Write a function to print the first n Fibonacci numbers.
  assert print_fibonacci_sequence(5) == "0 1 1 2 3 "
  assert print_fibonacci_sequence(8) == "0 1 1 2 3 5 8 13 "
  assert print_fibonacci_sequence(10) == "0 1 1 2 3 5 8 13 21 34 "
output: def print_fibonacci_sequence(n):
      if n <= 0:
          return ""
      elif n == 1:
          return "0 "
      
      fib_sequence = [0, 1]
      for i in range(2, n):
          fib_sequence.append(fib_sequence[-1] + fib_sequence[-2])
      
      return ' '.join(map(str, fib_sequence)) + ' '