Turtle - Torch placer

local usedFuel = 0
local usedTorches = 0

function fuelChk()
    if turtle.getFuelLevel() < 20 then
        turtle.select(1)
        if turtle.refuel(1) == false then
            print("Out of fuel!")
            exit()
        end
        usedFuel = usedFuel + 1
    end
end

function doStuffAndThings()
    print("Thank you for using our amazing freaking program")
    print("Q009 says hello")
    print("Please specify the space interval")
    local space = io.read()
    space = tonumber(space)
    local t = space
    if space < 1 then space = 1 end

    while true do
        fuelChk()
        if turtle.getItemCount(2) == 0 then
            print("Out of torches!")
            exit()
        end

        while turtle.detect() do
            sleep(5)
        end

        if t == space then
            turtle.select(2)
            while turtle.detectDown() do
                sleep(1)
            end
            turtle.placeDown()
            t = 0
        else
            t = t + 1
        end

        turtle.forward()

    end

    print("Done! Used fuel: " .. usedFuel .. " | placed torches: " .. usedTorches)
end

doStuffAndThings()