Turtle tanker

print("Current x coordinate:")
Coordx = read()

print("Current y coordinate:")
Coordy = read()

print("Current z coordinate:")
Coordz = read()

print("Currently Faceing(0,1,2,3):")
rotation = read()

startX = Coordx

startY = Coordy

startZ = Coordz


function turnLeft()

    turtle.turnLeft()

    rotation = rotation - 1

    if rotation == -1 then

        rotation = 3

    end

end

function turnRight()

    turtle.turnRight()

    rotation = rotation + 1

    if rotation == 4 then

        rotation = 0

    end

end

function dig()

    repeat

        x, y = turtle.inspect()

        if x == true then

            turtle.dig()

        end

        sleep(1)

    until x == false

end

function digUp()

    repeat

        x, y = turtle.inspectUp()

        if x == true then

            turtle.digUp()

        end

        sleep(1)

    until x == false

end

function digDown()

    repeat

        x, y = turtle.inspectDown()

        if x == true then

            turtle.digDown()

        end

        sleep(1)

    until x == false

end

function move(toMove)

    moved = 0

    while moved ~= toMove do

        repeat

            dig()
            x = turtle.forward()

        until x == true

        if rotation == 0 then

            Coordz = Coordz + 1

        elseif rotation == 1 then

            Coordx = Coordx - 1

        elseif rotation == 2 then

            Coordz = Coordz - 1

        elseif rotation == 3 then

            Coordx = Coordx + 1

        end

        moved = moved + 1

    end

end

function moveDown(toMove)

    moved = 0

    while moved ~= toMove do

        repeat

            digDown()
            x = turtle.down()

        until x == true

        Coordy = Coordy - 1
        moved = moved + 1

    end

end

function moveUp(toMove)

    moved = 0

    while moved ~= toMove do

        repeat

            digUp()
            x = turtle.up()

        until x == true


        Coordy = Coordy + 1
        moved = moved + 1

    end

end

function GoTo(x, y, z)

    if y - Coordy > 0 then

        moveUp(y - Coordy)

    else

        moveDown(-(y - Coordy))

    end

    if x - Coordx > 0 then

        while rotation ~= 3 do

            turnRight()

        end

        move(x - Coordx)

    else

        while rotation ~= 1 do

            turnRight()

        end


        move(-(x - Coordx))

    end


    if z - Coordz > 0 then

        while rotation ~= 0 do

            turnRight()

        end

        move(z - Coordz)

    else

        while rotation ~= 2 do

            turnRight()

        end

        move(-(z - Coordz))

    end

end

print("Go to x:")
x = read()

print("Go to y:")
y = read()

print("Go to z:")
z = read()


repeat

GoTo(x, y, z)

turtle.select(1)
turtle.placeDown()

sleep(15)

digDown()

GoTo(startX, startY, startZ)

turtle.select(1)
turtle.placeDown()

sleep(15)

digDown()

until 1 == 0

GoTo(oCoordx, oCoordy, oCoordz)