tur.lua

print("x: ")
local x = read()
print("y: ")
local y = read()
print("z: ")
local z = read()

z = math.ceil(z/2)

local ix = 0
local iy = 0
local iz = 0
local ii = 0

local block = turtle.inspectDown()
print(block)

turtle.refuel()

for iz = 0, z - 1  do
    for ix = 0, x - 1 do
        turtle.digUp()
        turtle.dig()
        turtle.forward()
    end
    ix = 0
    for iy = 0, y - 2 do
        turtle.refuel()
        turtle.getFuelLevel()
        if ii % 2 == 0 then
            turtle.turnRight()
            turtle.digUp()
            turtle.dig()
            turtle.forward()
            turtle.turnRight()
        else
            turtle.turnLeft()
            turtle.digUp()
            turtle.dig()
            turtle.forward()
            turtle.turnLeft()
        end
        ii = ii + 1
        for ix = 0, x - 1 do
            turtle.digUp()
            turtle.dig()
            turtle.forward()
        end
        ix = 0
    end
    iy = 0
    turtle.up()
    turtle.digUp()
    turtle.up()
    turtle.turnRight()
    turtle.turnRight()
end
block = turtle.inspectDown()
while not(block) do
    block = turtle.inspectDown()
    turtle.down()
end