feat: abstract classes and destroy subscriptions

apps/NwaifuAnime/src/app/services/parsers/parser.ts

@@ -0,0 +1,18 @@
+import { HttpClient } from "@angular/common/http";
+import { Injectable } from "@angular/core";
+import { Observable } from "rxjs";
+
+@Injectable({ providedIn: "root" })
+export abstract class Parser {
+  constructor(protected http: HttpClient) {}
+
+  protected abstract url: string;
+
+  abstract searchManga(query: string): Observable<object>;
+
+  abstract getDetails(slug_url: string): Observable<object>;
+
+  abstract getChapters(url: string): Observable<object>;
+
+  abstract getChapter(url: string, chapter: string, volume: string): Observable<object>;
+}