fix(guide): restructure curriculum guide articles (#36501)

* fix: restructure certifications guide articles
* fix: added 3 dashes line before prob expl
* fix: added 3 dashes line before hints
* fix: added 3 dashes line before solutions

guide/english/certifications/coding-interview-prep/rosetta-code/balanced-brackets/index.md

@@ -1,25 +1,24 @@
 ---
 title: Balanced brackets
 ---
-## Balanced brackets
+# Balanced brackets
 
-This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/coding-interview-prep/rosetta-code/balanced-brackets/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
 
-<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+---
+## Solutions
 
-<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+<details><summary>### Solution #1 (Click to Show/Hide)</summary>
 
-### Basic Solution
 ```js
 function isBalanced(str) {
-  if (str === '') return true;
+  if (str === "") return true;
 
-  str = str.split('');
+  str = str.split("");
   let stack = [];
   for (let i = 0; i < str.length; i++) {
-    if (str[i] === '[') {
-      stack.push('[');
-    } else if (str[i] === ']' && stack[stack.length - 1] === '[') {
+    if (str[i] === "[") {
+      stack.push("[");
+    } else if (str[i] === "]" && stack[stack.length - 1] === "[") {
       stack.pop();
     }
   }
@@ -32,3 +31,5 @@ function isBalanced(str) {
 - Push every `[` into a stack.
 - Check if the item stored on the stack is `[` when a `]` occurs. This makes it a pair & `[` can be removed from the stack.
 - The brackets are balanced if there is no item present in the stack.
+
+</details>