Fix trailing whitespace and add example file

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

examples/progress-step-format.php

@@ -0,0 +1,60 @@
+<?php
+
+require_once 'common.php';
+
+// Example 1: Default percentage-based format
+echo "Example 1: Default percentage-based format\n";
+$progress = new \cli\progress\Bar('Default format', 10);
+for ($i = 0; $i <= 10; $i++) {
+	$progress->tick();
+	usleep(100000);
+}
+$progress->finish();
+
+echo "\n";
+
+// Example 2: Step-based format (current/total)
+echo "Example 2: Step-based format (current/total)\n";
+$progress = new \cli\progress\Bar(
+	'Step format',
+	10,
+	100,
+	'{:msg}  {:current}/{:total} ['  // Custom formatMessage with current/total
+);
+for ($i = 0; $i <= 10; $i++) {
+	$progress->tick();
+	usleep(100000);
+}
+$progress->finish();
+
+echo "\n";
+
+// Example 3: Custom format combining steps and percentage
+echo "Example 3: Custom format combining steps and percentage\n";
+$progress = new \cli\progress\Bar(
+	'Mixed format',
+	50,
+	100,
+	'{:msg}  {:current}/{:total} ({:percent}%) ['  // Both current/total and percent
+);
+for ($i = 0; $i <= 50; $i++) {
+	$progress->tick();
+	usleep(50000);
+}
+$progress->finish();
+
+echo "\n";
+
+// Example 4: Large numbers with step format
+echo "Example 4: Large numbers with step format\n";
+$progress = new \cli\progress\Bar(
+	'Processing items',
+	1000,
+	100,
+	'{:msg}  {:current}/{:total} ['
+);
+for ($i = 0; $i <= 1000; $i += 50) {
+	$progress->tick(50);
+	usleep(20000);
+}
+$progress->finish();

lib/cli/progress/Bar.php

@@ -43,7 +43,7 @@ class Bar extends Progress {
 	 */
 	public function __construct($msg, $total, $interval = 100, $formatMessage = null, $formatTiming = null, $format = null) {
 		parent::__construct($msg, $total, $interval);
-		
+
 		if ($formatMessage !== null) {
 			$this->_formatMessage = $formatMessage;
 		}