Refactor code structure for improved readability and maintainability

src/backend/catalogue.py

@@ -48,7 +48,8 @@ class Catalogue:
         log.info(f"Searching for term: {searchterm}")
 
         links = self.get_book_links(searchterm)
-        print(links)
+        # debug: links
+        # print(links)
         for elink in links:
             result = self.search(elink)
             # in result search for class col-xs-12 rds-dl RDS_LOCATION
@@ -179,7 +180,8 @@ class Catalogue:
         for link in links:
             result = self.search(link)
             soup = BeautifulSoup(result, "html.parser")
-            print(link)
+            # debug: link
+            # print(link)
             ppn = link.split("/")[-1]
             if ppn and regex.match(r"^\d{8,10}[X\d]?$", ppn):
                 return ppn
@@ -273,14 +275,15 @@ class Catalogue:
 
                 # Find the signature for the entry whose location mentions "Semesterapparat"
                 for g in groups:
-                    print(g)
+                    # debug: group contents
+                    # print(g)
                     loc = g.get("location", "").lower()
                     if "semesterapparat" in loc:
                         signature = g.get("signature")
                         return signature
                     signature = g.get("signature")
                     return signature
-        print("No signature found")
+        # print("No signature found")
         return signature
 
     def in_library(self, ppn: str) -> bool: