View difference between Paste ID: HG8X1e3P and 7k1hApee

 local finished = false
 local wall = 0
 local x = 0
 local z = 0
 local x1 = 0
 local z1 = 0
 
 function line()
   turtle.select(2)
   if not turtle.detectDown() then
    turtle.placeDown()
    print("block placed")
   end
   if not turtle.detect() then
    turtle.forward()
    print("moving forward")
    if wall == 0 then
      x = x + 1
      else
        x = x - 1
    end
    else
      turtle.select(3)
      if turtle.compare() then
       finished = true
       print("i am finished")
       else
         print("I have reached a wall")
         if wall == 0 then
           turtle.turnRight()
           turtle.forward()
           z = z + 1
           turtle.turnLeft()
           while not turtle.detect() do
             turtle.forward()
             x = x + 1
           end
           print("I have reached the second wall")
 		  turtle.select(3)
 		  if turtle.compare() then
             finished = true
             print("i am finished")
           end
 		  turtle.select(2)
           wall = 1
           turtle.turnRight()
           turtle.turnRight()
           elseif wall == 1 then
             turtle.turnLeft()
             turtle.forward()
             z = z + 1
             turtle.turnRight()
             while not turtle.detect() do
               turtle.forward()
               x = x - 1
             end
             print("I have reached the third wall")
 			turtle.select(3)
 		    if turtle.compare() then
               finished = true
               print("i am finished")
             end
 		    turtle.select(2)
             wall = 0
             turtle.turnLeft()
             turtle.turnLeft()
         end
      end
   end
 end
 
 function base()
   if wall == 0 then
        turtle.turnLeft()
        else
          turtle.turnRight()
    end
    print(z1)
    print(x1)
    while z1 <= 1 do
      turtle.forward()
      z1 = z1 - 1
    end
    turtle.turnLeft()
    while x1 <= 1 do
      turtle.forward()
      x1 = x1 - 1
    end
    turtle.down()
    turtle.suck(2)
    if turtle.getItemCount(2) == 1 then
      print("Welp, no more items, ending.")
      turtle.turnLeft()
      turtle.turnLeft()
      finished = true
    end
    print("returning to work location")
    turtle.up()
    turtle.turnLeft()
    turtle.turnLeft()
    while x1 ~= x do
      turtle.forward()
      x1 = x1 + 1
    end
    turtle.turnRight()
    while z1 ~= z do
      turtle.forward()
      z1 = z1 + 1
    end
    turtle.down()
    if wall == 0 then
      turtle.turnLeft()
      else
        turtle.turnRight()
    end
 end
 
 while finished == false do
---  if turtle.getItemCount(2) == 1 then
+  if turtle.getItemCount(2) == 1 then
---    print("I have run out of blocks")
+    print("I have run out of blocks")
    -- os.pullevent("turtle_inventory")
    -- print("my inventory has changed, sure hope it was blocks")
 --   print("returning to base")
 --   turtle.up()
 --   z1 = z
 --   x1 = x
 --   base()
---  end
+    turtle.select(4)
 	turtle.transferTo(2)
 	turtle.select(5)
 	turtle.transferTo(2)
 	turtle.select(6)
 	turtle.transferTo(2)
 	turtle.select(7)
 	turtle.transferTo(2)
 	turtle.select(8)
 	turtle.transferTo(2)
 	turtle.select(9)
 	turtle.transferTo(2)
 	turtle.select(10)
 	turtle.transferTo(2)
 	turtle.select(11)
 	turtle.transferTo(2)
 	turtle.select(12)
 	turtle.transferTo(2)
 	turtle.select(13)
 	turtle.transferTo(2)
 	turtle.select(14)
 	turtle.transferTo(2)
 	turtle.select(15)
 	turtle.transferTo(2)
 	turtle.select(16)
 	turtle.transferTo(2)
 	turtle.select(2)
   end
   if turtle.getFuelLevel() < 1 then
     turtle.select(1)
     turtle.refuel(1)
     print("I have refueled")
   end
   line()
   print("restarting while loop")
 end