Moved logic to a service and left bookinfo as a separate container.

src/Api/AbstractBookInfo.php

@@ -4,16 +4,17 @@ namespace Techtube\Bookinfo\Api;
 
 abstract class AbstractBookInfo
 {
-    protected string $author;
-    protected string $isbn;
-    protected string $description;
-    protected string $title;
-    protected string $category;
-    protected string $cover_url;
-    protected int $pages;
-    protected string $series;
-    protected int $volume;
-    protected string $language;
-    protected string $datePublished;
+    public string $author;
+    public string $isbn;
+    public string $description;
+    public string $title;
+    public string $category;
+    public string $cover_url;
+    public int $pages;
+    public string $series;
+    public int $volume;
+    public string $language;
+    public string $datePublished;
 
+    abstract public function parse();
 }