Fixed some issues, added a way to manage players groups with in game commands

src/main/java/me/monster/ranks/command/permSubcommands/GroupSub.java

@@ -0,0 +1,48 @@
+package me.monster.ranks.command.permSubcommands;
+
+import me.monster.commands.SubCommand;
+import me.monster.ranks.database.DbManager;
+import me.monster.ranks.database.models.Groups;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.sql.SQLException;
+import java.util.List;
+
+public class GroupSub extends SubCommand {
+    @Override
+    public String getName() {
+        return "group";
+    }
+
+    @Override
+    public List<String> getAliases() {
+        return List.of("group", "groups", "rank", "ranks");
+    }
+
+    @Override
+    public String getDescription() {
+        return "Manage Groups";
+    }
+
+    @Override
+    public String getSyntax() {
+        return "/perm group <groupname>";
+    }
+
+    @Override
+    public void perform(CommandSender commandSender, String[] strings) {
+
+        commandSender.sendMessage("Test");
+
+    }
+
+    @Override
+    public List<String> getSubcommandArguments(Player player, String[] strings) {
+        try {
+            return List.of(DbManager.getAllGroups().stream().map(Groups::getGroupName).toArray(String[]::new));
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}