input: Write a function to optimize the given Python program by minimizing the number of lines and improving readability.
  numbers = [1, 2, 3, 4, 5, 6]
  print(*numbers, sep='\n')
  assert optimize([1, 2, 3, 4, 5, 6])
  assert optimize([10, 20, 30, 40, 50, 60])
output: def optimize(numbers):
      return '\n'.join(map(str, numbers))