consumeFuel

function consumeFuel(maxFuel)
    local refuel = false
    for i = 1, 16 do -- loop through the slots
        turtle.select(i) -- change to the slot
        local x = turtle.getItemDetail(i)
        if(x ~= nil) then
            local istr = string.sub(x.name,string.find(x.name,":",0)+1)
            print(istr,"    t")
            if(istr == "planks" or istr == "stick" or istr == "log") then
                turtle.refuel()
                refuel = true
            end
            if(turtle.getFuelLevel() < maxFuel and istr == "coal") then
                turtle.refuel(1)
                refuel = true
            end
        end
    end
    turtle.select(1)
    print(turtle.getFuelLevel())
    return refuel
end


print(consumeFuel(400))