fix: utils derive with example

Author: vladimirvolek

examples/all_requests.rs

@@ -138,6 +138,7 @@ async fn main() -> BlockfrostResult<()> {
     let nutlink_ticker_by_id = api.nutlink_ticker_by_id(ticker, pagination).await;
 
     // Utils
+    let derive_result = api.derive_address("d507c8f866691bd96e131334c355188b1a1d0b2fa0ab11545075aab332d77d9eb19657ad13ee581b56b0f8d744d66ca356b93d42fe176b3de007d53e9c4c4e7a", "0", "1").await;
 
     println!("root: {:#?}", root);
     println!("health: {:#?}", health);
@@ -237,6 +238,7 @@ async fn main() -> BlockfrostResult<()> {
         nutlink_address_ticker_by_id
     );
     println!("nutlink_ticker_by_id: {:#?}", nutlink_ticker_by_id);
+    println!("derive_result: {:#?}", derive_result);
 
     Ok(())
 }

src/api/endpoints/utils.rs

@@ -1,13 +1,17 @@
 use crate::{request::send_request, url::Url, *};
+use blockfrost_openapi::models::utils_addresses_xpub::UtilsAddressesXpub;
 use reqwest::{header::HeaderValue, Body, Method};
 use serde_json::from_str as json_from;
 
 impl BlockfrostAPI {
     pub async fn derive_address(
         &self, xpub: &str, role: &str, index: &str,
-    ) -> BlockfrostResult<String> {
-        self.call_endpoint(format!("/utils/addresses/xpub/{}/{}/{}", xpub, role, index).as_str())
-            .await
+    ) -> BlockfrostResult<UtilsAddressesXpub> {
+        self.call_endpoint(&format!(
+            "/utils/addresses/xpub/{}/{}/{}",
+            xpub, role, index
+        ))
+        .await
     }
 
     pub async fn utils_tx_evaluate(&self, transaction_data: Vec<u8>) -> BlockfrostResult<String> {