I wanted to “program” a /dupe command for my Minecraft Server, I was able to fix 2/3 bugs.

Many thanks in advance
Daniel

Error message

command /dupe:
    trigger:
        if player is holding an item:
            set {_item} to player's tool
            set {_amount} to amount of {_item}
            set {_newAmount} to {_amount} * 2
            set {_item} to {_item} with {_newAmount} amount
            give player {_item}

I tried to script a /dupe command that duplicates the selected item from the hotbar.