stairsToBedrock

local y=0
-- local tblStairs={"minecraft:cobblestone_stairs", "minecraft:stone_stairs", "extcaves:lavastone_stairs", "extcaves:polished_lavastone_stairs"} not working because if stairs direction!
local tblBlocks={"minecraft:cobblestone", "minecraft:dirt", "minecraft:netherrack", "extcaves:lavastone", "minecraft:basalt", "minecraft:blackstone", "create:weathered_limestone", "quark:deepslate", "quark:cobbled_deepslate", "minecraft:deepslate", "minecraft:cobbled_deepslate", "minecraft:tuff", "byg:soapstone", "byg:scoria_stone", "byg:scoria_cobblestone"}


function inTable(tbl, item)
    for i, v in ipairs(tbl) do
        if v == item then
            return true
        end
    end
    return false
end

function moveForw()
    local try=1
    while not turtle.forward() do
        print("I can't go forward .. try:"..try)
        sleep(1)
        try=try+1
    end
end

function moveUp()
    local try=1
    while not turtle.up() do
        print("I can't go up .. try:"..try)
        sleep(1)
        try=try+1
    end
end

function moveDown()
    local try=1
    while not turtle.down() do
        print("I can't go down .. try:"..try)
        sleep(1)
        try=try+1
    end
    y=y+1
end

function turnL()
    turtle.turnLeft()
end

function digForw()
    while turtle.detect() do
        turtle.dig()
    end
end

function digUp()
    while turtle.detectUp() do
        turtle.digUp()
    end
end

function digDown()
    turtle.digDown()
end

function selectStairs()
    for A=1,16 do
        local item=turtle.getItemDetail(A)
        if item then
            if (inTable(tblBlocks, item.name)) then
                turtle.select(A)
                return(1)
            end
        end
        if A==16 then
            return(0)
        end
    end
end

function placeStairs()
    if not turtle.detectDown() then
        A=selectStairs()
        if A==1 then
            local try=1
            while not turtle.placeDown() do
                print("I can't place down. a block !..Try: "..try)
                try=try+1
                sleep(1)
            end
        end
    end
end

function startBuilding()
    while true do
        success, data = turtle.inspectDown()
        if (data.name=="minecraft:bedrock") then break end
        digDown()
        placeStairs()
        success, data = turtle.inspect()
        if (data.name=="minecraft:bedrock") then break end
        digForw()
        moveForw()
        digUp()
        success, data = turtle.inspectDown()
        if (data.name=="minecraft:bedrock") then break end
        digDown()
        moveDown()
    end
end

function goback()
    turnL()
    turnL()
    digUp()
    moveUp()
    digUp()
    moveUp()
    for A=1,y-2 do
        digUp()
        moveUp()
        digUp()
        moveForw()
    end
    moveForw()
    digUp()
    moveForw()
end

startBuilding()
goback()