witherTurtle

local rednetSide    = "right"
local soulSand      = 1
local witherHead    = 2
local wireSide      = "back"
local block         = 16
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rednet.open(rednetSide)

function forward(a)
    for i=a, 1, -1 do
        turtle.forward()
    end
end

function up(a)
    for i=a, 1, -1 do
        turtle.up()
    end
end

function wither()
    up(1)
    turtle.select(block)
    turtle.dig()
    turtle.select(soulSand)
    forward(5)
    up(1)
    turtle.placeDown()
    up(1)
    turtle.placeDown()
    turtle.turnLeft()
    forward(1)
    turtle.placeDown()
    turtle.back()
    turtle.back()
    turtle.placeDown()
    forward(1)
    turtle.select(witherHead)
    turtle.place()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.place()
    turtle.turnLeft()
    turtle.back()
    turtle.place()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.down()
    turtle.down()
    forward(4)
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.select(block)
    turtle.place()
    turtle.down()
end

function suck()
    turtle.turnLeft()
    turtle.select(soulSand)
    turtle.suck()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.select(witherHead)
    turtle.suck()
    turtle.select(soulSand)
    turtle.turnLeft()
end

function kill()
    rs.setBundledOutput(wireSide, 1)
    sleep(1)
    rs.setBundledOutput(wireSide, 0)
end

while true do
    id, msg=rednet.receive()
    if msg == "go" then
        suck()
        wither()
        sleep(10)
        kill()
    end
end