export_links on game returns a hashSet

src/types/game.rs

@@ -1,4 +1,5 @@
 use std::{
+    collections::HashSet,
     io,
     path::{Path, PathBuf},
 };
@@ -20,8 +21,8 @@ impl Game {
         }
     }
 
-    pub fn export_links(&self) -> Result<Vec<Link>, io::Error> {
-        let links: Vec<Link> = walk_all_files(&self.path)?
+    pub fn export_links(&self) -> Result<HashSet<Link>, io::Error> {
+        let links: HashSet<Link> = walk_all_files(&self.path)?
             .map(|entry| {
                 Link::new(
                     entry.path(),