code: function extractPermlinkFromLink(steemitLink) {
    if (isValidSteemitLink(steemitLink)) {
      const usernamePos = steemitLink.search(/\/@.+\//);
      if (usernamePos === -1) return;
  
      const firstPart = steemitLink.slice(usernamePos + 1); // adding 1 to remove the first "/"
      return firstPart.slice(firstPart.search('/') + 1).replace('/', '').replace('#', '');
    }
  }
docs: Should input a full steemit article link and return the permlink of the article
  @param {string} steemitLink