fix: type in resolve title

src/traits/resolve_title.rs

@@ -4,23 +4,23 @@ use crate::typed::{
 };
 
 impl ResolveTitle for Page {
-    fn resolve_title(&self) -> Option<&String> {
+    fn resolve_title(&self) -> Option<String> {
         resolve_from_tags(&self.data)
     }
 }
 
-fn resolve_from_tags(tags: &Vec<Tag>) -> Option<&String> {
+fn resolve_from_tags(tags: &Vec<Tag>) -> Option<String> {
     for tag in tags {
         match tag {
             H(title, level) => {
                 if *level == Hl::One {
-                    return Some(title);
+                    return Some(title.to_owned());
                 }
             }
 
             Meta(body, key) => {
                 if key == "title" {
-                    return Some(body);
+                    return Some(body.to_owned());
                 }
             }
 

src/typed.rs

@@ -109,5 +109,5 @@ pub enum Hl {
 }
 
 pub trait ResolveTitle {
-    fn resolve_title(&self) -> Option<&String>;
+    fn resolve_title(&self) -> Option<String>;
 }