input: Write a python function to sort a list of integers in ascending order using bubble sort.
  assert sort_list([34, 23, 1, 67, 4]) == [1, 4, 23, 34, 67]
  assert sort_list([5, 3, 8, 6, 7, 2]) == [2, 3, 5, 6, 7, 8]
  assert sort_list([10, 9, 8, 7, 6, 5]) == [5, 6, 7, 8, 9, 10]
output: def sort_list(lst):
      n = len(lst)
      for i in range(n):
          for j in range(0, n-i-1):
              if lst[j] > lst[j+1]:
                  lst[j], lst[j+1] = lst[j+1], lst[j]
      return lst