updating DIRECTORY.md

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github-actions 2021-04-29 01:28:23 +00:00
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* [Jewels And Stones](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/strings/jewels_and_stones.rb)
* [Palindrome](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/strings/palindrome.rb)
* [Remove Vowels](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/strings/remove_vowels.rb)
* [Sudoku](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/strings/sudoku.rb)
* [Sudoku](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/sudoku.rb)
* [Two Sum](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/two_sum.rb)
* [Two Sum Ii](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/two_sum_ii.rb)
* Binary Trees