merge: Implement Add Two Numbers (Linked List) (#888)

* Implement Add Two Numbers (Linked List)

* Implement Add Two Numbers (Linked List)

* Implement Add Two Numbers (Linked List)

Co-authored-by: Shakil Ahmmed <shakilahmmed@ShakilAhmmeds-MacBook-Pro.local>

Data-Structures/Linked-List/test/AddTwoNumbers.test.js

@@ -0,0 +1,26 @@
+import { AddTwoNumbers } from '../AddTwoNumbers.js'
+import { LinkedList } from '../SinglyLinkedList'
+
+describe('AddTwoNumbers', () => {
+  it('Check Sum Of Two Linked List', () => {
+    const list1 = new LinkedList()
+    list1.addFirst(2)
+    list1.addLast(4)
+    list1.addLast(3)
+
+    const list2 = new LinkedList()
+    list2.addFirst(5)
+    list2.addLast(6)
+    list2.addLast(4)
+
+    const expected = new LinkedList()
+    expected.addFirst(7)
+    expected.addLast(0)
+    expected.addLast(8)
+
+    const addTwoLinkedList = new AddTwoNumbers()
+    addTwoLinkedList.solution(list1.headNode, list2.headNode)
+
+    expect(addTwoLinkedList.solutionToArray()).toEqual(expected.get())
+  })
+})