export const getInviterHandle = (url: string) => {
  const startIndex = url.indexOf('@');
  if (startIndex !== -1) {
    let endIndex = url.indexOf('/', startIndex);
    if (endIndex === -1) {
      endIndex = url.length;
    }

    return url.substring(startIndex + 1, endIndex);
  }
  return null;
};