chore: add reverse to singly linked list (#1241)

* Fix: Reverse Singly Linked List

* Added reverse in SinglyLinkedList

* Added reverse in SinglyLinkedList

* Changes made

Data-Structures/Linked-List/ReverseSinglyLinkedList.js

@@ -0,0 +1,16 @@
+/** A LinkedList based solution to reverse a number
+Problem Statement: Given a number such that each of its digit is stored in a singly linked list. Reverse the linked list and return the head of the linked list Link for the Problem: https://leetcode.com/problems/reverse-linked-list/ */
+class ReverseSinglyLinkedList {
+  solution (head) {
+    let prev = null
+    let next = null
+    while (head) {
+      next = head.next
+      head.next = prev
+      prev = head
+      head = next
+    }
+    return prev
+  };
+}
+export { ReverseSinglyLinkedList }