Fixed: Removed unnecessary author data from book endpoint

frontend/src/Store/Selectors/createBookAuthorSelector.js

@@ -0,0 +1,15 @@
+import { createSelector } from 'reselect';
+import createBookSelector from './createBookSelector';
+
+function createBookAuthorSelector() {
+  return createSelector(
+    createBookSelector(),
+    (state) => state.authors.itemMap,
+    (state) => state.authors.items,
+    (book, authorMap, allAuthors) => {
+      return allAuthors[authorMap[book.authorId]];
+    }
+  );
+}
+
+export default createBookAuthorSelector;