EndCrystalDestroyer

function getFrontBlock()
    local blockExists, blockData = turtle.inspect()
    return blockData.name
end

function removeObstacle()
    if turtle.detectUp() then
        turtle.digUp()
    end
end

function reverseSteps( x, y )
    for i = 1, x, 1 do
       turtle.back()
    end
    for i = 1, y, 1 do
        turtle.down()
    end
end

function displayError()
    print("Make sure to place the turtle where it is touching and facing the center of the obsidian pillar's side.")
end

local countY = 0
local block = getFrontBlock()
while block == "minecraft:obsidian" do
    removeObstacle()
    turtle.up()
    countY = countY + 1
    block = getFrontBlock()
end

if block == "minecraft:iron_bars" then
    turtle.dig()
end

countX = 0
block = getFrontBlock()
while block == nil and countX < 10 do
    turtle.forward()
    countX = countX + 1
    block = getFrontBlock()
end

if countX < 10 and block == "minecraft:bedrock" then
    turtle.attackUp()
else
    displayError()
end

reverseSteps( countX, countY )