[lua] bug in program variable won't increment

function digFloor(k)
i=1
j=1
msg=tostring(k)
rednet.send(5, msg) --debugging effort
if k==1 or k==3 or k==5 then --sets the direction to turn for the first line in a layer
	 forward=true
  else
	 forward=false
  end
  for j=1,10,1 do --cuts out a 10x10x1 layer of blocks
	  for i=1,9,1 do
		turtle.dig()
		turtle.forward()
	  end
  if j~=10 then --prevents the turning from breaking the pattern on the last instance of loop
	   if forward == false then
		 turtle.turnLeft()
		 turtle.dig()
		 turtle.forward()
		 turtle.turnLeft()
		 forward=true
	   else
		 turtle.turnRight()
		 turtle.dig()
		 turtle.forward()
		 turtle.turnRight()
		 forward=false
	   end
  else
	 turtle.turnLeft()
	 turtle.turnLeft()
  end
  end
end
i=0
k=1
down=true
x,y= rednet.receive() --receives the command to start the process
print(y) --confirmation of message
  if turtle.detect() then --checks to see if layer at turtle's level
	down=false
  end
if y=="quarry" then
for i=1,5,1 do
  if down==false then
	digFloor(k)
k=k+1
down=true
  else --if not then digs down one and continues for 5 layers
	turtle.digDown()
	turtle.down()
	digFloor(k)
k=k+1
down=true
  end
end
shell.run("go", "left", "2") --goes back to start point
shell.run("go", "forward", "9")
shell.run("go", "right")
shell.run("go", "forward", 9)
shell.run("go", "up", "5")
  for i=1,9,1 do --drops off the contents into a chest
   turtle.select(i)
   turtle.drop(64)
  end
end