rename modules after moving to appropriate folders

scripts/common.js

@@ -1,41 +0,0 @@
-// common.js provides the advanced data structures. 
-
-export class Queue {
-     #elements;
-
-     constructor() {
-          this.#elements = [];
-     }
-
-     enqueue(element) {
-          this.#elements.push(element);
-     }
-
-     dequeue() {
-          return this.#elements.shift();
-     }
-
-     isEmpty() {
-          return this.#elements.length <= 0;
-     }
-}
-
-export class Stack {
-     #elements;
-
-     constructor() {
-          this.#elements = [];
-     }
-
-     push(element) {
-          this.#elements.push(element);
-     }
-
-     pop() {
-          return this.#elements.pop();
-     }
-
-     isEmpty() {
-          return this.#elements.length <= 0;
-     }
-}