support for duplicated slashes in nested groups

flight/net/Route.php

@@ -87,7 +87,7 @@ class Route
      */
     public function __construct(string $pattern, $callback, array $methods, bool $pass, string $alias = '')
     {
-        $this->pattern = $pattern;
+        $this->pattern = str_replace('//', '/', $pattern);
         $this->callback = $callback;
         $this->methods = $methods;
         $this->pass = $pass;

tests/FlightTest.php

@@ -134,6 +134,21 @@ class FlightTest extends TestCase
         Flight::start();
     }
 
+    public function testStaticNestedGroups(): void {
+        Flight::group('/', static function (): void {
+            Flight::group('/', static function (): void {
+                Flight::route('GET /', static function (): void {
+                    echo "test";
+                });
+            });
+        });
+
+        Flight::request()->url = '/';
+
+        $this->expectOutputString('test');
+        Flight::start();
+    }
+
     public function testStaticRouteGet()
     {