Trying to get my dupe skript to detect if an blacklisted item is in an shulker so i won't dupe

[SoulzNate]

Hi 

Im trying to get my dupe skript to detect blacklisted item and not dupe them

command /dupe. [<number>]:
    permission: dupe.1
    trigger:
        if player's tool is a shulker box:
            set {_shulker} to player's tool
            loop all items in inventory of {_shulker}:
                if {@blacklist} contains loop-item:
                    send "{@prefix} &fShulker duplication cancelled! The shulker box contains blacklisted items."
                    stop

            send "{@prefix}: &fYou just duped the shulker box with its contents!" to player
            add player's tool to player's inventory
        else:
            # Rest of your existing duplication logic
            if {@blacklist} contains player's tool:
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else if held item is netherite sword named "&6&lSharp 6 sword":
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else if held item is paper named "&a$&2MVP rank Voucher&a$":
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else if held item is paper named "&a$&2VIP rank Voucher&a$":
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else:
                # Rest of your existing duplication logic

command /dupe. [<number>]:
    permission: dupe.1
    trigger:
        if player's tool is a shulker box:
            set {_shulker} to player's tool
            loop all items in inventory of {_shulker}:
                if {@blacklist} contains loop-item:
                    send "{@prefix} &fShulker duplication cancelled! The shulker box contains blacklisted items."
                    stop

            send "{@prefix}: &fYou just duped the shulker box with its contents!" to player
            add player's tool to player's inventory
        else:
            # Rest of your existing duplication logic
            if {@blacklist} contains player's tool:
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else if held item is netherite sword named "&6&lSharp 6 sword":
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else if held item is paper named "&a$&2MVP rank Voucher&a$":
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else if held item is paper named "&a$&2VIP rank Voucher&a$":
                send "{@prefix} &fYou <##ff4e4e>cannot &fdupe that item!"
                stop
            else:
                # Rest of your existing duplication logic