unused potions now are collected in the inventory and can be consumed with the p key

src/main.rs

@@ -103,12 +103,13 @@ fn main() -> Result<()> {
                 .style(Style::default().bg(Color::Blue));
             frame.render_widget(
                 Paragraph::new(format!(
-                    "Health: {}/{}\nExp: {}\nGold: {}\nLevel: {}",
+                    "Health: {}/{}\nExp: {}\nGold: {}\nLevel: {}\nInventory: {}",
                     game.get_player().get_life(),
                     game.get_player().get_max_life(),
                     game.get_player().get_experience(),
                     game.get_player().get_gold(),
-                    game.get_player().get_immutable_position().get_level() + 1
+                    game.get_player().get_immutable_position().get_level() + 1,
+                    game.get_player().inventory_size(),
                 ))
                 .block(block)
                 .wrap(Wrap { trim: true }),
@@ -155,6 +156,19 @@ fn main() -> Result<()> {
                                     .to_string(),
                             );
                         }
+                        KeyCode::Char('p') => {
+                            let gained_health = game.get_mutable_player().consume_inventory();
+                            if gained_health > 0 {
+                                game.messages.insert(
+                                    0,
+                                    format!(
+                                        "used a potion from inventory and gained {} health.",
+                                        gained_health
+                                    )
+                                    .to_string(),
+                                );
+                            }
+                        }
                         KeyCode::Char('q') => {
                             break;
                         }