fix avatar ordering

src/game.rs

@@ -194,8 +194,10 @@ impl ToString for Game {
         segments.push(self.avatar.to_string());
 
         for sprite in &self.sprites {
+            if ! is_string_numeric(sprite.id.to_base36()) {
                 segments.push(sprite.to_string());
             }
+        }
 
         for item in &self.items {
             segments.push(item.to_string());