input: Write a python function to print numbers from 0 to n.
  assert print_numbers(5) == None  # Output should be: 0 1 2 3 4 5
  assert print_numbers(3) == None  # Output should be: 0 1 2 3
  assert print_numbers(0) == None  # Output should be: 0
output: def print_numbers(n):
      for i in range(n + 1):
          print(i, end=' ')
      print()