Built new error module to hold document name.

src/action/addition.rs

@@ -33,8 +33,8 @@ impl Addition {
 }
 
 impl MessageAction for Addition {
-    fn doc_name(&self) -> NameType {
-        self.doc_name.clone()
+    fn doc_name(&self) -> &NameType {
+        &self.doc_name
     }
 }
 
@@ -46,8 +46,9 @@ mod additions {
     #[test]
     fn is_default_addition_empty() {
         let doc_name = Name::english(Uuid::new_v4().to_string().as_str());
+        let expected_name: NameType = doc_name.clone().into();
         let add = Addition::new(doc_name.clone());
-        assert_eq!(add.doc_name(), doc_name.into());
+        assert_eq!(add.doc_name(), &expected_name);
         assert_eq!(add.iter().count(), 0);
     }