View difference between Paste ID: LeJPRRmp and LxMMTScq

 local h = 1
 local fuelSlot = 1
 local stonePlace = 5
 local stoneReserve = 6
 local glassPlace = 9
 local glassReserve = 10
 
 local blanks = 0
 
 function filler()
  if turtle.getFuelLevel()<10 then
   turtle.select(fuelSlot)
   turtle.refuel(1)
  end
  if turtle.getItemCount(stonePlace)<3 then
   turtle.select(stoneReserve)
   turtle.transferTo(stonePlace)
  end
  if turtle.getItemCount(glassPlace)<3 then
   turtle.select(glassReserve)
   turtle.transferTo(glassPlace)
  end
 
  turtle.select(stonePlace)
 end
 
 function digMove()
  turtle.down()
  turtle.digDown()
 end
 
 function digToBedrock()
  turtle.digDown()
  while not turtle.detectDown() do
   filler()
   digMove()
  end
 end
 
 function checkForward()
   turtle.select(glassPlace)
   if (not turtle.detect()) or (turtle.compare()) then
-    blacks = blacks + 1
+    blanks = blanks + 1
   end
 end
 
 function placeWhat()
   blanks = 0
   checkForward()
   turtle.turnLeft()
   checkForward()
   turtle.turnRight()
   turtle.turnRight()
   checkForward()
   turtle.turnLeft()
   if (blanks == 0) then
    turtle.select(stonePlace)
   else
     turtle.select(glassPlace)
   end
 end
 
 function movePlace()
  if turtle.up() then
   turtle.placeDown()
   h = h + 1
  else
   turtle.digUp()
  end
 end
 
 digToBedrock()
 
 while h < 100 do
  filler()
  placeWhat()
  movePlace()
 end
 
 run()