text: Swap function for swapping data
code: if ( curr . next and curr . next . data > curr . data ) : NEW_LINE INDENT curr . next . data , curr . data = curr . data , curr . next . data NEW_LINE DEDENT prev = curr . next NEW_LINE if ( not curr . next ) : NEW_LINE INDENT break NEW_LINE DEDENT curr = curr . next . next NEW_LINE return head NEW_LINE