misc: Some code improvements

Author: 4drian3d

src/main/java/io/github/_4drian3d/authmevelocity/lastserver/configuration/ConfigurationContainer.java

@@ -11,9 +11,7 @@
 public final class ConfigurationContainer<C> {
     private final AtomicReference<C> config;
 
-    private ConfigurationContainer(
-            final C config
-    ) {
+    private ConfigurationContainer(final C config) {
         this.config = new AtomicReference<>(config);
     }
 
@@ -27,9 +25,7 @@ public static <C> ConfigurationContainer<C> load(Path path, Class<C> clazz) thro
         final HoconConfigurationLoader loader = HoconConfigurationLoader.builder()
                 .defaultOptions(opts -> opts
                         .shouldCopyDefaults(true)
-                        .header("""
-                    AuthMeVelocity-LastServer-Addon | by 4drian3d
-                    """)
+                        .header("AuthMeVelocity-LastServer-Addon | by 4drian3d")
                 )
                 .path(path)
                 .build();

src/main/java/io/github/_4drian3d/authmevelocity/lastserver/database/Database.java

@@ -29,6 +29,7 @@ CREATE TABLE IF NOT EXISTS last_server(\
 
     private final HikariDataSource source;
     private final Logger logger;
+
     @Inject
     public Database(
             final @DataDirectory Path dataDirectory,

src/main/java/io/github/_4drian3d/authmevelocity/lastserver/listener/DisconnectListener.java

@@ -12,6 +12,7 @@
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
+import java.util.function.Predicate;
 
 public final class DisconnectListener implements LastLoginListener<DisconnectEvent> {
     @Inject
@@ -33,15 +34,12 @@ public void register() {
         }
         return EventTask.async(() -> {
             final Player player = event.getPlayer();
-            final String server = player.getCurrentServer()
+            final List<String> excludedServers = plugin.config().get().getExcludedServers();
+            player.getCurrentServer()
                     .map(ServerConnection::getServerInfo)
                     .map(ServerInfo::getName)
-                    .orElse("");
-
-            List<String> excludedServers = plugin.config().get().getExcludedServers();
-            if (!excludedServers.contains(server)) {
-                database.setLastServer(player.getUsername(), server);
-            }
+                    .filter(Predicate.not(excludedServers::contains))
+                    .ifPresent(server -> database.setLastServer(player.getUsername(), server));
         });
     }
 }