bomb

-- helper functions --
function getItemIndex(itemName)
    for slot = 1, 16, 1 do
        local item = turtle.getItemDetail(slot)
        if (item ~= nil) then
            if(item["name"] ==itemName) then
                return slot
            end
        end
    end
end

-- real code --
redstone.setOutput("bottom", true)

function bomb()
    while true do
        local storageIndex = getItemIndex("minecraft:shulker_box")
        local bombIndex = getItemIndex("minecraft:tnt")
        turtle.forward()
        if turtle.getFuelLevel() < 10 then
            fuelIndex = getItemIndex("minecraft:coal")
            if fuelIndex ~= nil then
                turtle.select(fuelIndex)
                turtle.refuel()
            end
            if storageIndex ~= nil then
                turtle.select(storageIndex)
                turtle.suck()
                fuelIndex = getItemIndex("minecraft:coal")
                turtle.place()
                turtle.dig()
                turtle.suck()
            end
        end
    end
end

while true do
    bomb()
end