[BUGFIX] Remove whitespace and duplicate empty lines

Classes/Util/CodeSnippetCreator.php

@@ -97,17 +97,25 @@ public static function writeSimpleFile($content, $path): void
     public static function writeFile(array $entry, String $content, String $rstContent = '', $overwriteRst = false, String $indexContent = '', $overwriteIndex = false): void
     {
         $content = '..  Generated by https://github.com/TYPO3-Documentation/t3docs-codesnippets' . LF . $content;
+
         if (!$entry['targetFileName']) {
             throw new InvalidConfigurationException('targetFileName not set for action ' . $entry['action']);
         }
         if (!$content) {
             throw new InvalidConfigurationException('No content found for file ' . $entry['targetFileName']);
         }
+
+        // Ensure no trailing whitespaces on empty lines
+        $content = preg_replace("/\n\s*\n/", "\n\n", $content);
+
+        // Ensure content ends with exactly one empty line
+        $content = trim($content) . "\n";
+
         $filename = self::$configPath . '/' . $entry['targetFileName'];
         if (!file_exists(dirname($filename))) {
             mkdir(dirname($filename), 0755, true);
         }
-        $content = preg_replace("/\n\s+\n/", "\n\n", $content);
+
         GeneralUtility::writeFile(
             $filename,
             $content,