handle old room format

src/room.rs

@@ -84,7 +84,11 @@ impl From<String> for Room {
         let mut tiles: Vec<String> = Vec::new();
 
         for line in lines.into_iter() {
-            let line: Vec<&str> = line.split(",").collect();
+            let line: Vec<&str> = if line.contains(",") {
+                line.split(",").collect()
+            } else { // old room format
+                line.split("").collect()
+            };
 
             for tile_id in line {
                 tiles.push(tile_id.to_string());