fix(download): use path instead of filepath

internal/routes/download.go

@@ -5,7 +5,7 @@ import (
 	"log"
 	"net/http"
 	"net/url"
-	"path/filepath"
+	"path"
 	"strconv"
 
 	"tomatentum.net/svg-templater/pkg/format"
@@ -92,10 +92,10 @@ func DownloadSVG(w http.ResponseWriter, r *http.Request) {
 	w.Write(json)
 }
 
-func getPublicUrl(r *http.Request, path string) string {
+func getPublicUrl(r *http.Request, subpath string) string {
 	newURL := url.URL{
 		Host: r.Host,
-		Path: filepath.Join("public", path),
+		Path: path.Join("public", subpath),
 	}
 	newURL.Scheme = "http"
 	if r.TLS != nil {