input: Write a function to sort a list of integers in ascending order using a sorting algorithm. The function should take a list of integers as input and return the sorted list. If the input list is empty, it should return an empty list.
  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)