input: Write a function to take a list of integers and return the list with its elements in reversed order. If the list is empty, return the empty list.
  assert reverse_list([1, 3, 6, 8, 10])==[10, 8, 6, 3, 1]
  assert reverse_list([5, 4, 3, 2, 1])==[1, 2, 3, 4, 5]
  assert reverse_list([1])==[1]
  assert reverse_list([])==[]
  assert reverse_list([100, 200, 300])==[300, 200, 100]
output: def reverse_list(lst):
      return lst[::-1]