uucore/clap_l10n: use iterator from lines()

Author: cakebaker

src/uucore/src/lib/mods/clap_localization.rs

@@ -243,8 +243,8 @@ fn handle_invalid_value_error(err: Error, maybe_colorize: impl Fn(&str, Color) -
     } else {
         // Fallback if we can't extract context - use clap's default formatting
         let rendered_str = err.render().to_string();
-        let lines: Vec<&str> = rendered_str.lines().collect();
-        if let Some(main_error_line) = lines.first() {
+
+        if let Some(main_error_line) = rendered_str.lines().next() {
             eprintln!("{main_error_line}");
             eprintln!();
             eprintln!("{}", translate!("common-help-suggestion"));
@@ -284,10 +284,9 @@ pub fn handle_clap_error_with_exit_code(err: Error, util_name: &str, exit_code:
             }
 
             // For other simple validation errors, use the same simple format as other errors
-            let lines: Vec<&str> = rendered_str.lines().collect();
-            if let Some(main_error_line) = lines.first() {
+            if let Some(main_error_line) = rendered_str.lines().next() {
                 // Keep the "error: " prefix for test compatibility
-                eprintln!("{}", main_error_line);
+                eprintln!("{main_error_line}");
                 eprintln!();
                 // Use the execution phrase for the help suggestion to match test expectations
                 eprintln!("{}", translate!("common-help-suggestion"));
@@ -323,11 +322,10 @@ pub fn handle_clap_error_with_exit_code(err: Error, util_name: &str, exit_code:
 
             // For other errors, show just the error and help suggestion
             let rendered_str = err.render().to_string();
-            let lines: Vec<&str> = rendered_str.lines().collect();
 
             // Print error message (first line)
-            if let Some(first_line) = lines.first() {
-                eprintln!("{}", first_line);
+            if let Some(first_line) = rendered_str.lines().next() {
+                eprintln!("{first_line}");
             }
 
             // For other errors, just show help suggestion