Can Someone Help With This Program?

Hello,

I have been trying off and on for weeks to make a program that does 3x3 Mining Tunnel, Desired Ore Detection, AutoFuel, and Torch Placement and I can't seem to get it to function 100%. I was thinking maybe a fresh pair of eyes will be able to help finish the code. Right now as it stands: Desired Ore Detection does not work, if the turtle runs out of fuel or manages to somehow detect the desired ore it doesnt resume where it left off when refueled or ore removed it restarts the dig function from the beginning causing undesired tunnel shape. As far as I am aware the Torch Placement and the AutoFuel both work correctly.

    function text()
		    shell.run("clear")
		    print("Fuel level: ".. turtle.getFuelLevel())
		    print ""
		    if turtle.getItemCount(16) == 0 then
				    print "Warning: NO TORCHES LOADED in SLOT 16"
				    print ""
		    end
    end
	
    function digCompare()
		    turtle.select(15)
		    if turtle.getItemCount(15) == 0 then
				    print ""
				    print "DESIRED ORE is MISSING from SLOT 15!"
				    while turtle.getItemCount(15) == 0 do
						    sleep(1)
				    end
		    end
		    if turtle.compare() == true then
				    print ""
				    print "DESIRED ORE LOCATED!"
				    print ""
				    while turtle.compare() == true do
						    sleep(1)
				    end
				    turtle.select(1)
		    else
				    dig()
				    sleep(.6)
				  
		    end
		    turtle.select(15)
		    if turtle.compareUp() == true then
				    print ""
				    print "DESIRED ORE LOCATED!"
				    print ""
				    while turtle.compareUp() == true do
						    sleep(1)
				    end
				    turtle.select(1)
		    else
				    dig()
				    sleep(.6)
		    end
    end
	
    function dig()
				    turtle.dig()
				    turtle.forward()
				    turtle.turnLeft()
				    turtle.dig()
				    turtle.turnRight()
				    turtle.turnRight()
				    turtle.dig()
				    turtle.turnLeft()
				    turtle.digUp()
				    turtle.up()
				    turtle.turnLeft()
				    turtle.dig()
				    turtle.turnRight()
				    turtle.turnRight()
				    turtle.dig()
				    turtle.turnLeft()
				    turtle.digUp()
				    turtle.up()
				    turtle.turnLeft()
				    turtle.dig()
				    turtle.turnRight()
				    turtle.turnRight()
				    turtle.dig()
				    turtle.turnLeft()
				    turtle.down()
				    turtle.down()
				    sleep(.6)
    end
	
    function DesiredOreDetection()
		    io.write "Turn Desired Ore Detection on? (Y/N): "
		    s = io.read()
		    if s == "y" then
				    if turtle.getItemCount(15) == 0 then
						    print ""
						    print "Place DESIRED ORE in SLOT 15."
						    while turtle.getItemCount(15) == 0 do
								    sleep(1)
						    end
				    end
		    end
		    if s ~= "y" then
				    if s ~= "n" then
						    print ""
						    print "Please enter (Y) or (N)"
						    print ""
						    DesiredOreDetection()
				    else
						    autoFuel()
				    end
		    else
				    autoFuel()
		    end
    end
	
    function autoFuel()
		    io.write "Turn Automatic Re-Fueling on? (Y/N): "
		    f = io.read()
		    if f ~= "y" then
				    if f ~= "n" then
						    print ""
						    print "Please enter (Y) or (N)"
						    print ""
						    autoFuel()
				    else
				    start()
				    end
		    else
		    start()
		    end
    end
	
    function start()
		    io.write "Enter length of tunnel: "
		    d = io.read()
		    if not tonumber(d) then
				    print ""
				    print "Invalid Selection"
				    print ""
				    start()
		    else
				    d = tonumber(d)
		    end
		    if d < 1 then
				    print ""
				    print "Invalid Number"
				    print ""
				    start()
		    end
    end
	
    function placeTorch()
		    turtle.turnLeft()
		    turtle.turnLeft()
		    turtle.select(16)
		    turtle.place()
		    turtle.select(1)
		    turtle.turnRight()
		    turtle.turnRight()
    end
	
    function addFuel()
		    print ""
		    print "Add fuel to continue..."
		    turtle.select(1)
		    while turtle.getFuelLevel() == 0 do
				    turtle.refuel()
				    sleep(1)
		    end
		    print ""
		    print "Yummy, thank you!"
		    print ""
    end
	
    function fuelCheck()
		    if turtle.getFuelLevel() == 0 then
				    if f == "y" then
						    for i = 1, 16 do
								    turtle.select(i)
								    turtle.refuel(1)
								    if turtle.getFuelLevel() > 0 then
										    turtle.select(1)
										    break
								    end
						    end
				    if turtle.getFuelLevel() == 0 then
						    addFuel()
				    end
				    else
						    addFuel()
				    end
		    end
    end
	
    t = 8
    text()
    DesiredOreDetection()
    turtle.refuel()
    for i = 1, d do
		    fuelCheck()
		    turtle.placeDown()
		    if s == "y" then
				    digCompare()
		    else
				    dig()
		    end
		    t = t + 1
		    if t == 10 then
				    placeTorch()
				    t = 0
		    end
    end

Split into new topic.