sort urls alphabetically

index.js

function sortUrls(urls) {
  return urls
    .map(link => {
      const normalizedLink = /^(https?:\/\/)?(www\.)?/.exec(link)[0]
      return [link.replace(normalizedLink, ''), normalizedLink]
    })
    .sort(([a], [b]) => {
      if(a < b) return -1
      if(a > b) return 1
      return 0
   })
    .map(([link, prefix]) => prefix + link)
    .join('\n')
}