input: Write a function to optimize the given Python program which prints each element of a list on a new line. The function should take a list of numbers as input and return the optimized program as a string. 
  
  assert optimize_printing([1, 2, 3, 4, 5, 6])=='print(*[1, 2, 3, 4, 5, 6], sep=\\'\\n\\')'
  assert optimize_printing([7, 8, 9])=='print(*[7, 8, 9], sep=\\'\\n\\')'
  assert optimize_printing([])=='print(*[], sep=\\'\\n\\')'
output: def optimize_printing(numbers):
      return f"print(*{numbers}, sep='\\n')"