Turtle House Builder

turnTurn = "right"
hasBlocks = true
function turnOpposite()
    if turnTurn == "right" then
        turtle.turnLeft()
    else
        turtle.turnRight()
    end
end
function autoRefuel()
    if turtle.getFuelLevel() < 40 then
        for a = 1, 16, 1 do
            turtle.select(a)
            if turtle.refuel(2) == true then
                break
            end
        end
    end
    turtle.select(1)
end

local function checkForBlocks()
    hasBlocks = false
    for a = 1, 16, 1 do
        if turtle.getItemSpace(a) ~= 0 then
            itemDetail = turtle.getItemDetail(a)
            if itemDetail[1] ~= 263 then
                hasBlocks = true
            end
        end
    end
    if hasBlocks == false then
        print("Ran out of blocks. Insert blocks and press a key.")
        sleep(0)
        local event, keystroke = os.pullEvent("char")
    end
end

function checkIfHasBlocks()
        checkForBlocks()
    while hasBlocks == false do
        checkForBlocks()
    end
end

function makeFloor()
    for a = 1, width, 1 do
        for b = 1, length, 1 do
            checkIfHasBlocks()
            turtle.placeDown()
            if b ~= length then
                turtle.forward()
            end
        end
        if a ~= width then
            if turnTurn == "right" then
                turnTurn = "left"
                turtle.turnRight()
                turtle.forward()
                turtle.turnRight()
            else
                turnTurn = "right"
                turtle.turnLeft()
                turtle.forward()
                turtle.turnLeft()
            end
        else
            turnOpposite()
        end
    end
    turtle.up()
end

function makeWall()
    for a = 1, 2, 1 do
        for b = 1, length, 1 do
            checkIfHasBlocks()
            turtle.placeDown()
            if b ~= length then
                turtle.forward()
            end
        end
        turnOpposite()
        for b = 1, width, 1 do
            checkIfHasBlocks()
            turtle.placeDown()
            if b ~= width then
                turtle.forward()
            end
        end
        turnOpposite()
    end
    turtle.up()
end

function makeHouse()
    if botfloor then
        makeFloor()
    end
    for a = 1, floors, 1 do
        for b = 1, height, 1 do
            makeWall()
        end
        makeFloor()
    end
end

print("Place turtle to far left of house.")
print("Enter forward length:")
length = tonumber(read())
print("Enter right width:")
width = tonumber(read())
print("Enter height of each floor:")
height = tonumber(read())
print("Enter amount of floors:")
floors = tonumber(read())
print("Make bottom floor? (y/n)")
botfloor = read()
if botfloor == "y" then
    botfloor = true
else
    botfloor = false
end
print("Constructing...")
makeHouse()
print("Complete.")