limit inventory to 10 slots

src/artifacts.rs

@@ -93,10 +93,11 @@ impl Artifact for Potion {
             );
             self.health = 0;
             self.was_collected = true;
-        } else {
+        } else if player.add_to_inventory(self) {
             messages.insert(0, "move potion to inventory.".to_string());
-            player.add_to_inventory(self);
             self.was_collected = true;
+        } else {
+            messages.insert(0, "inventory is full.".to_string());
         }
     }
 

src/main.rs

@@ -103,7 +103,7 @@ fn main() -> Result<()> {
                 .style(Style::default().bg(Color::Blue));
             frame.render_widget(
                 Paragraph::new(format!(
-                    "Health: {}/{}\nExp: {}\nGold: {}\nLevel: {}\nInventory: {}",
+                    "Health: {}/{}\nExp: {}\nGold: {}\nLevel: {}\nInventory: {}/10",
                     game.get_player().get_life(),
                     game.get_player().get_max_life(),
                     game.get_player().get_experience(),

src/player.rs

@@ -69,8 +69,13 @@ impl Player {
         rand::thread_rng().gen_range(1..4)
     }
 
-    pub fn add_to_inventory(&mut self, potion: &Potion) {
-        self.inventory.push(*potion);
+    pub fn add_to_inventory(&mut self, potion: &Potion) -> bool {
+        if self.inventory.len() < 10 {
+            self.inventory.push(*potion);
+            true
+        } else {
+            false
+        }
     }
 
     pub fn inventory_size(&self) -> usize {