updating DIRECTORY.md

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github-actions 2020-09-08 01:31:23 +00:00
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* [Palindrome](https://github.com/TheAlgorithms/Java/blob/master/strings/Palindrome.java)
* [Pangram](https://github.com/TheAlgorithms/Java/blob/master/strings/Pangram.java)
* [ReverseString](https://github.com/TheAlgorithms/Java/blob/master/strings/ReverseString.java)
* [Rotation](https://github.com/TheAlgorithms/Java/blob/master/strings/Rotation.java)
* [Upper](https://github.com/TheAlgorithms/Java/blob/master/strings/Upper.java)