if(e.getCurrentItem().getItemMeta().getDisplayName().equals("§eSandstein")) {
                e.setCancelled(true);
                for(ItemStack stack : player.getInventory().getContents()){
                     if(stack.getItemMeta().getDisplayName().equals("§cBronze") && stack.getAmount() >= 2) {
                         stack.setAmount(stack.getAmount() - 1);
                         player.getInventory().addItem(new ItemAPI("§eSandstein", Material.SANDSTONE, (byte)0, 2).build());
                         return;
                     }else if(stack.getItemMeta().getDisplayName().equals("§cBronze") && stack.getAmount() == 1){
                         player.getInventory().remove(stack);
                         player.getInventory().addItem(new ItemAPI("§eSandstein", Material.SANDSTONE, (byte)0, 2).build());
                         return;
                     }else {
                         player.sendMessage("§7[§cBedWars§7] §cDu hast nicht genügend Resourcen für dieses Shop-Item!");
                         player.playSound(player.getLocation(), Sound.ANVIL_BREAK, 10, 10);
                         return;
                     }
                }


            }