SonarLint fixes

src/main/java/de/rwu/easydrop/service/retriever/CatalogueRetriever.java

@@ -71,7 +71,9 @@ public class CatalogueRetriever {
             }
 
             productCatalogues.add(newProductCatalogue);
-            LOGGER.info("\nLoaded Catalogue: \n" + newProductCatalogue.toString());
+            String catString = String.format(
+                    "%nLoaded Catalogue: %n%s", newProductCatalogue.toString());
+            LOGGER.info(catString);
         }
     }
 }

src/main/java/de/rwu/easydrop/service/retriever/ProductRetriever.java

@@ -94,9 +94,9 @@ public class ProductRetriever {
      */
     public Product getProductFromWebshop(final Webshop shop, final String productIdentifier) {
         switch (shop) {
-            case Amazon:
+            case AMAZON:
                 return getProductFromAmazon(productIdentifier);
-            case eBay:
+            case EBAY:
                 return getProductFromEbay(productIdentifier);
             default:
                 return null;