refactor: groups all data structures (TheAlgorithms#113)

* refactor: groups all data structures

* refactor: groups hashing files in set/map folder

Author: zFl4wless

data_structures/doubly_linked_list.ts renamed to data_structures/list/doubly_linked_list.ts

@@ -0,0 +1,24 @@
+import { DoublyLinkedList } from "../doubly_linked_list";
+import { testLinkedList } from "./linked_list";
+
+describe("DoublyLinkedList", () => {
+    testLinkedList(DoublyLinkedList);
+
+    it("should reverse the list", () => {
+        const list: DoublyLinkedList<number> = new DoublyLinkedList<number>();
+
+        list.append(1);
+        list.append(2);
+        list.append(3);
+        list.reverse();
+
+        expect(list.get(0)).toBe(3);
+        expect(list.get(1)).toBe(2);
+    });
+
+    it("should return null for reverse when list is empty", () => {
+        const list: DoublyLinkedList<number> = new DoublyLinkedList<number>();
+
+        expect(list.reverse()).toBeNull();
+    });
+});

data_structures/linked_list.ts renamed to data_structures/list/linked_list.ts

@@ -1,4 +1,4 @@
-import { Map } from "../map";
+import { Map } from "./map";
 
 /**
  * Represents a hash map.

data_structures/singly_linked_list.ts renamed to data_structures/list/singly_linked_list.ts

@@ -1,4 +1,4 @@
-import { HashMapEntry } from "./hashing/hash_map";
+import { HashMapEntry } from "./hash_map";
 
 /**
  * This interface is a representation of the Map data structure.

data_structures/list/test/doubly_linked_list.test.ts

@@ -1,4 +1,4 @@
-import { HashMap } from "../hash_map";
+import { HashMap } from "../../map/hash_map";
 
 describe("Hash Map", () => {
     let hashMap: HashMap<string, number>;