first steps with refs

src/game.rs

@@ -1,7 +1,23 @@
 use crate::level::Level;
 use crate::player::Player;
 
+pub const LEVELS: usize = 2;
+
 pub struct Game<'game> {
     pub player: &'game mut Player,
-    pub levels: Vec<&'game mut Level>,
+    pub levels: Vec<Level>,
+}
+
+impl Game<'_> {
+    pub fn new(p: &mut Player) -> Game {
+        let mut v: Vec<Level> = Vec::with_capacity(LEVELS);
+        for _ in 0..LEVELS {
+            let mut l = Level::new();
+            v.push(l);
+        }
+        Game {
+            player: p,
+            levels: v,
+        }
+    }
 }