function fuelCheck()
    if turtle.getFuelLevel() <20 then
        turtle.select(1)
        turtle.refuel()
        print("Refueling...")
    end
end

local logs = {
    ["forge:logs"] = true,
    ["minecraft:spruce_log"] = true,
    ["minecraft:oak_log"] = true,
    ["minecraft:birch_log"] = true
    }

while true do
    local isPresent, blockData = turtle.inspect()
    if logs[blockData.name] then
        
        fuelCheck()
        print("Beginning Harvesting...")
        while turtle.detect() do
            turtle.dig()
            turtle.suck()
            turtle.digUp()
            turtle.up()
        end

        while not turtle.detectDown() do
            print("Moving down...")
            turtle.down()
        end
    end
    turtle.select(2)
    turtle.place()
        
    turtle.suck()
    turtle.turnLeft()
    turtle.suck()
    turtle.turnLeft()
    turtle.suck()
    turtle.turnLeft()
    turtle.suck()
    turtle.turnLeft()

    turtle.select(3)
    turtle.dropDown()
    turtle.select(4)
    turtle.dropDown()
    turtle.select(5)
    turtle.dropDown()
    turtle.select(6)
    turtle.dropDown()
    turtle.select(7)
    turtle.dropDown()
    turtle.select(8)
    turtle.dropDown()
    
end
print("Completed Harvesting, Dropping Materials...")
print("Dropping completed, waiting fo rnew tree to grow...")