public static string Run(string left = "1 3 5 7 9", string right = "0 2 4 6 8")
{
ListNode leftLink = ListNodeHelper.StringToListNode(left);
ListNode rightLink = ListNodeHelper.StringToListNode(right);
ListNode result = MergeTwoLists(leftLink, rightLink);
return(ListNodeHelper.ListNodeToString(result));
}