input: Write a python function to sort a list of integers in ascending order using selection sort.
  assert sort_list([1, 5, 7, 8, 4, 10, 2]) == [1, 2, 4, 5, 7, 8, 10]
  assert sort_list([10, 9, 8, 7, 6, 5, 4, 3, 2, 1]) == [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
  assert sort_list([5, 4, 3, 2, 1]) == [1, 2, 3, 4, 5]
output: def sort_list(arr):
      for i in range(len(arr)):
          min_idx = i
          for j in range(i+1, len(arr)):
              if arr[j] < arr[min_idx]:
                  min_idx = j
          arr[i], arr[min_idx] = arr[min_idx], arr[i]
      return arr