facing = 1
checked = 0

function left()
    turtle.turnLeft()
    facing = facing - 1
    if facing == 0 then
        facing = 4
    else
        facing = facing
    end
end

function right()
    turtle.turnRight()
    facing = facing + 1
    if facing == 5 then
        facing = 1
    else
        facing = facing
    end
end

function turnAround()
    right()
    right()
end

function clearBack()
    turnAround()
    turtle.dig()
    turnAround()
end

function clearFront()
    turtle.dig()
end

local success, findCoal = 1

function refuel()
    if turtle.getFuelLevel() < 200 then
        print("refueling now... I can only move ", turtle.getFuelLevel(), "more blocks...")
        turtle.select(1)
        while turtle.select("minecraft:coal") == false do
            findCoal = findCoal + 1
            turtle.select(findCoal)
        end
        print("I found coal in slot ", turtle.select(), ". Eating it now!")
        turtle.refuel()
        print("done! I can now move ", turtle.getFuelLevel(), "more blocks!")
    else
        print("I dont need fuel right now! I can still move ", turtle.getFuelLevel(), " more blocks!")
    end
end

while true do
    turtle.back()
    right()
    turtle.forward()
    turtle.forward()
    left()
    turtle.forward()
    checked = 1
    turtle.back()
    left()
    turtle.forward()
    turtle.forward()
    right()
    turtle.forward()
    checked = 0
    refuel()
end