diff --git a/src/inventory/currency.rs b/src/inventory/currency.rs
index fd88fc2..561e737 100644
--- a/src/inventory/currency.rs
+++ b/src/inventory/currency.rs
@@ -27,14 +27,14 @@ impl Storage for CurrencyStorage {
     fn get_slot_mut(&mut self, index: u16) -> &mut Item {
         match index {
             0 => &mut self.gil,
-            _ => panic!("{} is not a valid src_container_index?!?", index),
+            _ => panic!("{index} is not a valid src_container_index?!?"),
         }
     }
 
     fn get_slot(&self, index: u16) -> &Item {
         match index {
             0 => &self.gil,
-            _ => panic!("{} is not a valid src_container_index?!?", index),
+            _ => panic!("{index} is not a valid src_container_index?!?"),
         }
     }
 }
diff --git a/src/inventory/equipped.rs b/src/inventory/equipped.rs
index d07e7e2..32afecb 100644
--- a/src/inventory/equipped.rs
+++ b/src/inventory/equipped.rs
@@ -56,7 +56,7 @@ impl Storage for EquippedStorage {
             11 => &mut self.right_ring,
             12 => &mut self.left_ring,
             13 => &mut self.soul_crystal,
-            _ => panic!("{} is not a valid src_container_index?!?", index),
+            _ => panic!("{index} is not a valid src_container_index?!?"),
         }
     }
 
@@ -76,7 +76,7 @@ impl Storage for EquippedStorage {
             11 => &self.right_ring,
             12 => &self.left_ring,
             13 => &self.soul_crystal,
-            _ => panic!("{} is not a valid src_container_index?!?", index),
+            _ => panic!("{index} is not a valid src_container_index?!?"),
         }
     }
 }