builder_CC

local length = 40
local height = 5
local width = 5

local function select_block()
    for slot=1,16 do
        if turtle.getItemCount(slot) ~= 0 then
            turtle.select(slot)
            return true
        end
    end
    return false
end

local function build_step()
    if select_block() then
        turtle.placeDown()
        return true
    end
    return false
end

local function build_line()
    for i=1, length-1 do
        build_step()
        turtle.forward()
    end
    build_step()
end

local function build_flat()
    for i=1, width -1 do
        build_line()
        if math.fmod(i, 2) == 1 then
            turtle.turnRight()
            turtle.forward()
            turtle.turnRight()
        else
            turtle.turnLeft()
            turtle.forward()
            turtle.turnLeft()
        end
    end
    build_line()
end

local function build_volume()
    for i=1, height-1 do
        build_flat()
        turtle.turnLeft()
        turtle.turnLeft()
        turtle.up()
    end
    build_flat()
    if math.fmod(height, 2) == 1 then
        turtle.turnLeft()
        for i=1, width-1 do
            turtle.forward()
        end
        turtle.turnLeft()
        for i=1, length-1 do
            turtle.forward()
        end
    end
    turtle.forward()
    for i=1, height do
        turtle.down()
    end
    turtle.turnLeft()
    turtle.turnLeft()
end

need_fuel = height*width*length+length+width+height
print("Fuel: "..turtle.getFuelLevel())
print("Need: "..need_fuel)
if turtle.getFuelLevel() > need_fuel then
    turtle.up()
    build_volume()
else
    print("not enough fuel!!!")
end
print("Fuel: "..turtle.getFuelLevel())