Added 302 - Leetcode

Added 302 - Leetcode - 0002 Add Two Numbers
Changed directory name from 301 to 301 - Witch Jobsite

302 - Leetcode/0002 Add Two Numbers/AddTwoNumbers.java

@@ -0,0 +1,39 @@
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode() {}
+ *     ListNode(int val) { this.val = val; }
+ *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
+ * }
+ */
+class Solution {
+    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
+
+        ListNode prePreFirstResult = new ListNode();
+        prePreFirstResult.next = new ListNode();
+        ListNode result = prePreFirstResult.next;
+        int carry = 0;
+        // While a new node is necessary...
+        while (carry == 1 || l1 != null || l2 != null){
+            if (l1 == null){
+                l1 = new ListNode(0);
+            }
+            if (l2 == null){
+                l2 = new ListNode(0);
+            }
+            ListNode nextResult = new ListNode ((l1.val + l2.val + carry)%10);
+            result.next = nextResult;
+            if (l1.val + l2.val + carry >= 10){
+                carry = 1;
+            } else {
+                carry = 0;
+            }
+            l1 = l1.next;
+            l2 = l2.next;
+            result = nextResult;            
+        }
+        return prePreFirstResult.next.next;
+    }
+}