implement ToString for Position

src/main.rs

@@ -717,14 +717,17 @@ fn test_position_from_string() {
     )
 }
 
-fn position_to_string(position: Position) -> String {
+impl ToString for Position {
-    format!("{},{}", position.x, position.y)
+    #[inline]
+    fn to_string(&self) -> String {
+        format!("{},{}", self.x, self.y)
+    }
 }
 
 #[test]
 fn test_position_to_string() {
     assert_eq!(
-        position_to_string(Position { x: 4, y: 12 }),
+        Position { x: 4, y: 12 }.to_string(),
         "4,12".to_string()
     )
 }
@@ -759,7 +762,7 @@ fn avatar_to_string(avatar: Avatar) -> String {
         "SPR A\n{}\nPOS {} {}",
         animation_frames_to_string(avatar.animation_frames),
         avatar.room,
-        position_to_string(avatar.position)
+        avatar.position.to_string()
     )
 }
 
@@ -828,7 +831,7 @@ fn sprite_to_string(sprite: Sprite) -> String {
         if sprite.name.is_some() {format!("\nNAME {}", sprite.name.unwrap())} else {"".to_string()},
         if sprite.dialogue.is_some() {format!("\nDLG {}", sprite.dialogue.unwrap())} else {"".to_string()},
         sprite.room,
-        position_to_string(sprite.position),
+        sprite.position.to_string(),
     )
 }
 
@@ -916,7 +919,7 @@ fn test_exit_from_string() {
 }
 
 fn exit_to_string(exit: Exit) -> String {
-    format!("{} {}", exit.room, position_to_string(exit.position))
+    format!("{} {}", exit.room, exit.position.to_string())
 }
 
 #[test]
@@ -1113,7 +1116,7 @@ fn room_to_string(room: Room) -> String {
 
     for instance in room.items {
         items.push_str(
-            &format!("\nITM {} {}", instance.id, position_to_string(instance.position))
+            &format!("\nITM {} {}", instance.id, instance.position.to_string())
         );
     }
 
@@ -1121,7 +1124,7 @@ fn room_to_string(room: Room) -> String {
         exits.push_str(
             &format!(
                 "\nEXT {} {}",
-                position_to_string(instance.position),
+                instance.position.to_string(),
                 exit_to_string(instance.exit)
             )
         );
@@ -1129,7 +1132,7 @@ fn room_to_string(room: Room) -> String {
 
     for instance in room.endings {
         endings.push_str(
-            &format!("\nEND {} {}", instance.id, position_to_string(instance.position))
+            &format!("\nEND {} {}", instance.id, instance.position.to_string())
         );
     }