Updated the README.md
added link back to the article:
@@ -11,4 +11,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Find the Longest Substring without Repeating Characters](https://www.baeldung.com/java-longest-substring-without-repeated-characters)
- [Permutations of an Array in Java](https://www.baeldung.com/java-array-permutations)
- [Find the Smallest Missing Integer in an Array](https://www.baeldung.com/java-smallest-missing-integer-in-array)
+- [Permutations of a String in Java](https://www.baeldung.com/java-string-permutations)
- More articles: [[<-- prev]](/algorithms-miscellaneous-3) [[next -->]](/algorithms-miscellaneous-5)
