add proper wall building and ceiling building

src/main.lua

@@ -268,9 +268,35 @@ local function printdes(buf, dimensions)
     move("forward")
 
     for cy=1,dimensions["y"],1 do
-        for cz=1,dimensions["z"],1 do
-            for cx=1,dimensions["x"],1 do
-                placebuf(buf, cx, cy, cz)
+        for _=1,3,1 do -- build floor
+            for cz=1,dimensions["z"],1 do
+                for cx=1,dimensions["x"],1 do
+                    placebuf(buf, cx, cy, cz)
+                    move("forward")
+                end
+                -- return to standard pos but +1 to z
+                --move("back")
+                move("right")
+                move("forward")
+                move("right")
+                for _=1,dimensions["x"],1 do
+                    move("forward")
+                end
+                move("right")
+                move("right")
+            end
+            -- return to standard pos but +1 to y
+            move("left")
+            for _=1,dimensions["z"],1 do
+                move("forward")
+            end
+            move("right")
+            move("up")
+        end
+        -- build ceiling/floor
+        for _=1,dimensions["z"],1 do
+            for _=1,dimensions["x"],1 do
+                place("down")
                 move("forward")
             end
             -- return to standard pos but +1 to z