input: Write a function to reverse a given list. If the input list is provided, the function should return the list in reverse order. If the input list is empty, the function should return an empty list.
  def reverse_list(list): 
      return list[::-1]
  assert reverse_list([1,2,3,4,5])==[5,4,3,2,1]
  assert reverse_list([])==[]
output: def reverse_list(list): 
      return list[::-1]