made some refactoring

src/Pattern/SOLID/SingleResponsibility/SalesReportOutputInterface.php

@@ -0,0 +1,17 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-07
+ * @time: 03:50
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\SOLID\SingleResponsibility;
+
+interface SalesReportOutputInterface
+{
+    public function output($sales): string;
+}