Refactor code structure for improved readability and maintainability

test.py

@@ -0,0 +1,13 @@
+from src.bibapi import SWB
+from src.bibapi.sru import PicaSchema, QueryTransformer
+
+s_title = "TITLE=Java ist auch eine Insel"
+s_author = "AUTHOR=Ullenboom,Christian"
+
+arguments = ["PPN=1172719780"]
+transformed = QueryTransformer(api_schema=PicaSchema, arguments=arguments).transform()
+print(transformed)
+
+result = SWB().getBooks(transformed)
+for book in result:
+    print(book)