Update SLUG field in server side post_create and put_update hooks.

api/hooks/lib/helper.js

@@ -0,0 +1,17 @@
+const generateArticleSlugUrlString = (article) => {
+    let slug = article.content.slug
+    let title = article.content.title
+
+    if (!slug || slug === "") {
+        slug = title
+            .replace(/[^a-zA-Z0-9 ]/g, "")
+            .replace(/\s/g, "-")
+            .toLowerCase()
+    }
+
+    return slug
+}
+
+module.exports = {
+    generateArticleSlugUrlString,
+}