input: Write a function to print the Fibonacci series up to n numbers where n is a user input. The function should return None.
  assert fibonacci_series(10)
  assert fibonacci_series(5)
  assert fibonacci_series(0)
  assert fibonacci_series(15)
  assert fibonacci_series(1)
output: def fibonacci_series(n):
      a, b = 0, 1
      for _ in range(n):
          print(a, end=' ')
          a, b = b, a + b
      print()