Switch a lot of Strings to Arc<str>

src/settings.rs

@@ -1,5 +1,7 @@
 use serde::{Deserialize,Serialize};
 
+use std::sync::Arc;
+
 /* Response format */
 
 #[derive(Deserialize, Serialize, Clone, Copy)]
@@ -39,13 +41,13 @@ pub struct QuerySettings {
 	pub format: ResponseFormat,
 	pub lang: String,
 	pub available_dns_resolvers: Vec<Selectable>,
-	pub dns_resolver_id: String,
+	pub dns_resolver_id: Arc<str>,
 }
 
 #[derive(Deserialize, Serialize, Clone)]
 pub struct Selectable {
-	pub id: String,
-	pub name: String,
+	pub id: Arc<str>,
+	pub name: Arc<str>,
 	pub weight: i32,
 }