refactor: changed Cookie to use Cow to facilitate using references when building

src/models/server_models.rs

@@ -1,5 +1,7 @@
 //! This module provides the models to parse cookies and search parameters from the search
 //! engine website.
+use std::borrow::Cow;
+
 use serde::Deserialize;
 
 use super::parser_models::Style;
@@ -23,23 +25,23 @@ pub struct SearchParams {
 #[derive(Deserialize)]
 pub struct Cookie<'a> {
     /// It stores the theme name used in the website.
-    pub theme: &'a str,
+    pub theme: Cow<'a, str>,
     /// It stores the colorscheme name used for the website theme.
-    pub colorscheme: &'a str,
+    pub colorscheme: Cow<'a, str>,
     /// It stores the user selected upstream search engines selected from the UI.
-    pub engines: Vec<String>,
+    pub engines: Cow<'a, Vec<Cow<'a, str>>>,
     /// It stores the user selected safe search level from the UI.
     pub safe_search_level: u8,
 }
 
 impl<'a> Cookie<'a> {
     /// server_models::Cookie contructor function
-    pub fn build(style: &'a Style, mut engines: Vec<String>, safe_search_level: u8) -> Self {
+    pub fn build(style: &'a Style, mut engines: Vec<Cow<'a, str>>, safe_search_level: u8) -> Self {
         engines.sort();
         Self {
-            theme: &style.theme,
-            colorscheme: &style.colorscheme,
-            engines,
+            theme: Cow::Borrowed(&style.theme),
+            colorscheme: Cow::Borrowed(&style.colorscheme),
+            engines: Cow::Owned(engines),
             safe_search_level,
         }
     }