feat: adds Kimberlee's ListNode.java file

Author: haldanek

lesson_12/structs_java/structs_app/src/main/java/com/codedifferently/lesson12/ListNode.java

@@ -14,4 +14,39 @@ public class ListNode {
     this.val = val;
     this.next = next;
   }
+
+
+public static String listWinner(ListNode head) {
+  int evenScore = 0;
+  int oddScore = 0;
+
+  ListNode current = head;
+  while (current != null && current.next != null) {
+    int evenVal = current.val;
+    int oddVal = current.next.val;
+
+    if (evenVal > oddVal) {
+      evenScore++;
+    } else if (oddVal > evenVal) {
+      oddScore++;
+    }
+
+    current = current.next.next;
+    }
+
+  if (evenScore > oddScore) {
+    return "Even";
+  } else if (oddScore > evenScore) {
+    return "Odd";
+  } else {
+    return "Tie";
+  }
+}
+
+public static void main(String[] args) {
+  ListNode head = new ListNode(2, new ListNode(5, new ListNode(4, new ListNode(7, new ListNode(20, new ListNode(5))))));
+
+  String winner = listWinner(head);
+  System.out.println("The winner is: " + winner);
 }
+}