Mine

local distance = 0;
local torchSlot = 16;
local light = 10;
local teste = true;

print("Donnez la longueur a creuser :")
depth = tonumber(read())

print("Donnez le nombre de galeries : ")
nbpts = tonumber(read())

for j=1,nbpts do
    for i=1,depth do
        while not turtle.forward() do
                turtle.dig()
        end
        turtle.digUp()
        light = light-1
        if light <=0 then
            turtle.turnRight()
            turtle.turnRight()
            turtle.select(torchSlot)
            turtle.place()
            turtle.select(1)
            light = 10
            turtle.turnRight()
            turtle.turnRight()
        end
    end
    if teste then
        turtle.turnRight()
        for h=1,3 do
            while not turtle.forward() do
                turtle.dig()
            end
            turtle.digUp()
        end
        turtle.turnRight()
        teste = false
    else
        turtle.turnLeft()
        for h=1,3 do
            while not turtle.forward() do
                turtle.dig()
            end
            turtle.digUp()
        end
        turtle.turnLeft()
        teste = true
    end
end