Updated the problems-sets-competitive-programming.md file (#8013)

* Updated the problems-sets-competitive-programming.md file

This PR will add a free guided path to strengthen DSA by Coding Ninjas which is a latest and updated guided path

* Updated and removed the error

more/problem-sets-competitive-programming.md

@@ -100,6 +100,7 @@
 * [Codility](https://codility.com/programmers/)
 * [Coding Bat](http://codingbat.com/java)
 * [Coding Interview Questions and answers for practice \| Python, Java & C++](https://www.codingninjas.com/codestudio/problems) - CodingNinjas
+* [Coding Ninjas Guided Paths](https://www.codingninjas.com/codestudio/guided-paths/data-structures-algorithms)
 * [CSES Problem Set](https://cses.fi/problemset/)
 * [DSA Learning Series](https://www.codechef.com/LEARNDSA)
 * [Dynamic A2OJ Ladder](https://a2oj.herokuapp.com)