edited urls.py and views.py

janang_reading/bookshelf/templates/bookshelf/book_details.html

-{%  extends 'base.html' %}
+{% extends 'base.html' %}
+{% load static %}
 
 {% block title %}{{ books.title }}{% endblock %}
-{% block header %}{{ books.title }}{% endblock %}
 {% block content %}
 
-    <a href="/authors/{{ books.author.pk }}/details/">{{ books.author.pk }}</a><br>
+    {% block header %}<h1>{{ books.title }}</h1>{% endblock %}
+    <a href="/bookshelf/author/{{ books.author.pk }}/details/">{{ books.author.pk }}</a><br>
     <p>{{ books.publisher }}</p>
     <p>{{ books.year_published }}</p>
     <p>{{ books.year_ISBN }}</p>
     <p>{{ books.year_blurb }}</p>
 
-    <a href="/homepage/">Home</a>&nbsp;&nbsp;
-    <a href="/books/">Books</a>&nbsp;&nbsp;
-    <a href="/authors/">Authors</a>
-    
+    <a href="/bookshelf/">Home</a>&nbsp;&nbsp;
+    <a href="/bookshelf/books/">Books</a>&nbsp;&nbsp;
+    <a href="/bookshelf/author/">Authors</a>
+
 {% endblock %}
\ No newline at end of file