Support links without options

Author: mohorev

src/UrlBuilder.php

@@ -96,8 +96,11 @@ public function url(string $src, ?string $extension = null): string
     {
         $format = $extension ? new ImageFormat($extension) : null;
 
-        $opt = implode('/', $this->options);
-        $path = sprintf('/%s/%s', $opt, $this->source($src, $format));
+        $path = implode('/', [
+            '',
+            ...$this->options,
+            $this->source($src, $format),
+        ]);
 
         return sprintf('/%s%s', $this->signature($path), $path);
     }

tests/UrlBuilderTest.php

@@ -114,6 +114,13 @@ public function signedData(): array
                 'plain' => '/0c-LLep4C-7PBda91FC_d5nEJpyyGH1qzNuifVFG32k/w:300/h:400/rt:fit/plain/http://example.com/image.jpg',
                 'encoded' => '/0pEYejprWvTcn8ZeJzbHU91zCGFpWjOHMaWhY57aISs/w:300/h:400/rt:fit/aHR0cDovL2V4YW1w/bGUuY29tL2ltYWdl/LmpwZw.jpg',
             ],
+            [
+                'src' => 'local:///logos/evil_martians.png',
+                'format' => 'jpg',
+                'options' => [],
+                'plain' => '/ULisISQ1rO57bD0OFBi0sQQjngiG5hLM1G8lZNrmFnU/plain/local:///logos/evil_martians.png@jpg',
+                'encoded' => '/UXBqIs6HQ2FlcNLEcx5V0OGfuujgcBZynk0r500gf7A/bG9jYWw6Ly8vbG9n/b3MvZXZpbF9tYXJ0/aWFucy5wbmc.jpg',
+            ],
         ];
     }