refactor: Add getURL()

lib/get-url.js

@@ -0,0 +1,19 @@
+function getURL(os, extended, version) {
+  let extendedStr = "";
+  let ext = "tar.gz";
+
+  if (extended === true) {
+    extendedStr = "extended_";
+  }
+
+  if (os === "Windows") {
+    ext = "zip";
+  }
+
+  const hugoName = `hugo_${extendedStr}${version}_${os}-64bit`;
+  const url = `https://github.com/gohugoio/hugo/releases/download/v${version}/${hugoName}.${ext}`;
+
+  return url;
+}
+
+module.exports = getURL;