refactor: optimize debug system, remove redundant code & tests

tests/game.rs

@@ -1,12 +0,0 @@
-use pacman::constants::RAW_BOARD;
-use pacman::map::builder::Map;
-
-mod item;
-
-#[test]
-fn test_game_map_creation() {
-    let map = Map::new(RAW_BOARD).unwrap();
-
-    assert!(map.graph.node_count() > 0);
-    assert!(!map.grid_to_node.is_empty());
-}