add MediaLofi in kontor-gin (#97)

Co-authored-by: Thomas Peetz <thomas.peetz@cimt-ag.de>
Reviewed-on: #97

kontor-gin/internal/helpers/url.go

@@ -0,0 +1,22 @@
+package helpers
+
+import (
+	"log/slog"
+	"net/url"
+)
+
+func StripUrl(webLink string, keepParam string) string {
+	u, err := url.Parse(webLink)
+	if err != nil {
+		slog.Info("StripUrl", "error", err)
+		return webLink
+	}
+	values := u.Query()
+	for key := range values {
+		if key != keepParam {
+			values.Del(key)
+		}
+	}
+	u.RawQuery = values.Encode()
+	return u.String()
+}