private List<String> getLeaderNames(PlayerInfo pi) {
   List<String> trustedOn = pi.getTrustedOn();
   List<String> leaderNames = new ArrayList<>();
   for (String islandName : trustedOn) {
     us.talabrek.ultimateskyblock.api.IslandInfo islandInfo = plugin.getIslandInfo(islandName);
     if (islandInfo != null && islandInfo.getLeader() != null) {
       leaderNames.add(islandInfo.getLeader());
     }
   }
   return leaderNames;
 }