input: Write a function to implement a sorting algorithm in Python that takes a list of integers as input and outputs the list sorted in ascending order.
  assert sort_ascending([3, 4, 5, 1, 2])==[1, 2, 3, 4, 5]
  assert sort_ascending([3, 5, 10, 1, 2])==[1, 2, 3, 5, 10]
  assert sort_ascending([4, 3, 1, 2])==[1, 2, 3, 4]
  assert sort_ascending([3, 5, 4, 1, 2])==[1, 2, 3, 4, 5]
  assert sort_ascending([])==[]
output: def sort_ascending(lst):
      return sorted(lst)