converted inventory systems into a module

src/inventory/remove_system.rs

@@ -0,0 +1,32 @@
+use super::{gamelog, Equipped, InBackpack, Name, WantsToRemoveItem};
+use specs::prelude::*;
+
+pub struct ItemRemoveSystem {}
+
+impl<'a> System<'a> for ItemRemoveSystem {
+    #[allow(clippy::type_complexity)]
+    type SystemData = (
+        Entities<'a>,
+        ReadExpect<'a, Entity>,
+        ReadStorage<'a, Name>,
+        WriteStorage<'a, WantsToRemoveItem>,
+        WriteStorage<'a, Equipped>,
+        WriteStorage<'a, InBackpack>,
+    );
+
+    fn run(&mut self, data: Self::SystemData) {
+        let (entities, player_entity, names, mut wants_remove, mut equipped, mut backpack) = data;
+
+        for (entity, to_remove) in (&entities, &wants_remove).join() {
+            equipped.remove(to_remove.item);
+            if let Some(name) = names.get(to_remove.item) {
+                if entity == *player_entity {
+                    gamelog::Logger::new().append("You unequip the").item_name_n(&name.name).period().log();
+                }
+            }
+            backpack.insert(to_remove.item, InBackpack { owner: entity }).expect("Unable to insert backpack");
+        }
+
+        wants_remove.clear();
+    }
+}