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

src/player.rs

@@ -1,6 +1,7 @@
 use rand::Rng;
 use std::cmp::{max, min};
 
+use crate::artifacts::Potion;
 use crate::position::{HasPosition, Position};
 
 pub struct Player {
@@ -10,6 +11,7 @@ pub struct Player {
     max_life: i16,
     gold: usize,
     experience: usize,
+    inventory: Vec<Potion>,
 }
 
 impl Player {
@@ -21,6 +23,7 @@ impl Player {
             max_life,
             gold: 0,
             experience: 0,
+            inventory: vec![],
         }
     }
     pub fn get_name(&self) -> String {
@@ -65,6 +68,25 @@ impl Player {
     pub fn damage(&self) -> usize {
         rand::thread_rng().gen_range(1..4)
     }
+
+    pub fn add_to_inventory(&mut self, potion: &Potion) {
+        self.inventory.push(*potion);
+    }
+
+    pub fn inventory_size(&self) -> usize {
+        self.inventory.len()
+    }
+
+    pub fn consume_inventory(&mut self) -> usize {
+        if self.is_healthy() {
+            return 0;
+        }
+        if let Some(potion) = self.inventory.pop() {
+            self.change_life(potion.get_health() as i16);
+            return potion.get_health();
+        }
+        0
+    }
 }
 
 impl HasPosition for Player {
@@ -85,6 +107,7 @@ fn test_get_name() {
         max_life: 10,
         gold: 0,
         experience: 0,
+        inventory: vec![],
     };
     assert_eq!(p.get_name(), "Teddy Tester");
 }
@@ -108,6 +131,7 @@ fn test_change_life() {
         max_life: 10,
         gold: 0,
         experience: 0,
+        inventory: vec![],
     };
     assert_eq!(p.get_life(), 5);
     p.change_life(-2);
@@ -141,6 +165,7 @@ fn test_max_life() {
         max_life: 10,
         gold: 0,
         experience: 0,
+        inventory: vec![],
     };
     assert_eq!(p.get_max_life(), 10);
 }