text: exports.createShortUrl = size => {
    let a = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
    let rand = 0;
    let short = [];
    for (let n = 0; n < size; n++) {
      rand = Math.floor(Math.random() * 62);
      short.push(a.substr(rand, 1));
    }
    return short.join('');
  };
  