mine

term.write("Enter height+1: ")
h = read()
term.write("Enter width-1: ")
w = read()
term.write("Enter length: ")
l = tonumber(read())
for y = 1,h,1 do
  for z = 1,w,1 do
    alt = -1+z
    for x = 1,l,1 do
      if(turtle.detect())
      then
        turtle.dig()
      end
      if(turtle.detectUp())
      then
        turtle.digUp()
      end
      if((z > 1 and x < l) or (z == 1))
      then
        turtle.forward()
      end
    end
    if(alt % 2 == 0)
    then
      turtle.turnLeft()
      turtle.dig()
      turtle.forward()
      turtle.turnLeft()
    else
      turtle.turnRight()
      turtle.dig()
      turtle.forward()
      turtle.turnRight()
    end
  end
  if(turtle.detectDown())
  then
    turtle.digDown()
  end
  turtle.down()
end