###Overview:

This pull request introduces the implementation of Ukkonen's algorithm for building suffix trees, enhancing our project's capabilities in string processing and pattern matching.

Details:

Added a new JavaScript file, ukkonen-suffix-tree.js #20 , which contains the implementation of Ukkonen's algorithm for suffix tree construction.
Utilized ES6 best practices for coding, including class syntax, arrow functions, and the Map data structure.
Provided comprehensive comments within the code to enhance readability and maintainability.
Included relevant test cases to verify the correctness of the algorithm and ensure it functions as expected.

Motivation:

The motivation behind this implementation is to provide a powerful tool for efficient string processing and pattern matching within our project. Suffix trees have numerous applications, including text indexing, data compression, and bioinformatics, and Ukkonen's algorithm offers an optimized way to construct them.

Testing:

Comprehensive testing has been performed to validate the correctness and robustness of the implemented algorithm. Test cases cover a wide range of input scenarios and edge cases to ensure that the code functions as expected.

Contributor's Checklist:

Added the implementation of Ukkonen's algorithm for suffix tree construction.
Provided clear comments and documentation within the code.
Included relevant test cases.
Verified that the code passes all tests.
Followed ES6 best practices and modern JavaScript coding conventions.

Reviewer's Checklist:

Reviewed the code for correctness and adherence to best practices.
Checked the quality and coverage of test cases.
Assessed the clarity and completeness of comments and documentation.