command /zaloz:
    trigger:
        if {slot0.%player%} is not set:
            set {slot0.%player%} to "%player's tool%"
            remove player's tool from player's inventory
        else if {slot1.%player%} is not set:
            set {slot1.%player%} to "%player's tool%"
            remove player's tool from player's inventory
       # I tak dalej......
command /gui:
    trigger:
        wait 2 ticks
        open chest with 1 rows named "NAZWA" # Dalem przykladowa ilosc linijek :)
        wait 1 tick
        if {slot0.%player%} is set:
            set slot 0 of player's current inventory to {slot0.%player%} 
        if {slot1.%player%} is set:
            set slot 1 of player's current inventory to {slot1.%player%} 
        # I tak dalej....
on inventory click:
    if inventory name of player's current inventory is "NAZWA":
        cancel event
        if clicked slot is 0:
            if {slot0.%player%} is set:
                add {slot0.%player%} to player's inventory
                clear {slot0.%player%}
        else if clicked slot is 1:
            if {slot1.%player%} is set:
                add {slot1.%player%} to player's inventory
                clear {slot1.%player%}
                # I tak dalej .. ....