OC - funcs

local function feedGenerator()
    for i = robotFirstInventorySlot, robot.inventorySize(), 1 do
        robot.select(i)
        if gen.insert(16) then
            return
        end
    end
end

local function purge()
    for i = robotFirstInventorySlot, robot.inventorySize(), 1 do
        robot.select(i)
        if robot.compareTo(3) or robot.compareTo(4) or robot.compareTo(5) then
            robot.drop()
        end
    end
end

local function changeDirection()
    if direction == "front" then
        direction = "back"
    elseif direction == "back" then
        direction = "front"
    end
end

local function turnLeft()
    robot.turnLeft()
    robot.swing()
    robot.forward()
    robot.turnLeft()
end

local function turnRight()
    robot.turnRight()
    robot.swing()
    robot.forward()
    robot.turnRight()
end

local function moving(distanceFront, distanceSide, distanceDown)
    local k = 0
    while k < distanceDown do
        print(k)
        local j = 0
        while j < distanceSide -1 do
            print(j)
            local i = 0
            while i < distanceFront - 1 do
                print(i)
                robot.swing() -- action here
                if robot.forward() then
                    i = i + 1
                end
            end
            if computer.energy() < 5000 then
                feedGenerator()
            end
            if distanceSide % 2 == 0 then
                if direction == "front" then
                    if j % 2 == 0 then
                        turnRight()
                    else
                        turnLeft()
                    end
                elseif direction == "back" then
                    if j % 2 == 0 then
                        turnLeft()
                    else
                        turnRight()
                    end
                end
            else
                if direction == "front" then
                    if j % 2 == 0 then
                        turnRight()
                    else
                        turnLeft()
                    end
                elseif direction == "back" then
                    if j % 2 == 0 then
                        turnRight()
                    else
                        turnLeft()
                    end
                end
            end
            j = j + 1
        end
        local l = 1
        while l < distanceFront do
            print(l)
            robot.swing()
            if robot.forward() then
                l = l + 1
            end
        end
        if k == (distanceDown - 1) then
            print("ENDING")
            purge()
            gen.remove()
            computer.shutdown(false)
        end
        purge()
        robot.swingDown()
        robot.down()
        robot.turnAround()
        changeDirection()
        k = k + 1
    end
end