Clean up example.

speech-dispatcher/examples/list_voices.rs

@@ -5,19 +5,19 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     let modules = connection.list_output_modules()?;
     println!("Modules available: {:?}", modules);
-    for module in modules.into_iter() {
+    for module in modules {
         if connection.set_output_module(&module).is_ok() {
-            println!("Listing voices for module {}", module);
+            println!("Listing voices for module {module}");
         } else {
-            println!("Failed to set output module to {}", module);
+            println!("Failed to set output module to {module}");
             continue;
         };
         let voices = connection.list_synthesis_voices()?;
-        for voice in voices.into_iter() {
+        for voice in voices {
-            if let Some(variant) = voice.variant.as_deref() {
+            if let Some(variant) = voice.variant {
                 println!(
-                    "    Name: {} / Language: {} / Variant: {}",
+                    "    Name: {} / Language: {} / Variant: {variant}",
-                    voice.name, voice.language, variant
+                    voice.name, voice.language
                 );
             } else {
                 println!("    Name: {} / Language: {}", voice.name, voice.language);