Fix issue with book ids and names not handling integers correctly.

app/Handlers/UlbXmlImportHandler.php

@@ -117,8 +117,8 @@ class UlbXmlImportHandler
         $this->document = $this->openBook($filepath);
 
         $book = Book::create([
-            'id' => strtolower($bookTitle),
-            'name' => ucfirst($bookTitle),
+            'id' => $this->prepareBookId($bookTitle),
+            'name' => $this->prepareBookName($bookTitle),
         ]);
 
         $chapterCollection = $this->document->getElementsByTagName('chapter');
@@ -471,4 +471,37 @@ class UlbXmlImportHandler
 
         return $document;
     }
+
+    /**
+     * @param string $bookTitle
+     * @return string
+     */
+    protected function prepareBookName(string $bookTitle) : string
+    {
+        $parts = $this->parseBookTitle($bookTitle);
+        return !isset($parts[1]) ? ucfirst($parts[0]) : $parts[0] . " " . ucfirst($parts[1]);
+    }
+
+    /**
+     * @param string $bookTitle
+     * @return string
+     */
+    protected function prepareBookId(string $bookTitle) : string
+    {
+        $parts = $this->parseBookTitle($bookTitle);
+        return !isset($parts[1]) ? strtolower($parts[0]) : $parts[0] . " " . strtolower($parts[1]);
+    }
+
+    /**
+     * @param string $bookTitle
+     * @return array|string[]
+     */
+    protected function parseBookTitle(string $bookTitle) : array
+    {
+        if (is_int((int) substr($bookTitle, 0, 1))) {
+            return [ substr($bookTitle, 0, 1),  substr($bookTitle, 1) ];
+        } else {
+            return [ $bookTitle ];
+        }
+    }
 }