refactor: fix typo in class name LongestNonRepetitiveSubstring

[alxkm]

Fix typo in class name

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.89%. Comparing base (622a3bf) to head (f7f6152).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5359      +/-   ##
============================================
+ Coverage     45.88%   45.89%   +0.01%     
- Complexity     2856     2857       +1     
============================================
  Files           525      525              
  Lines         15418    15418              
  Branches       2917     2917              
============================================
+ Hits           7074     7076       +2     
+ Misses         8048     8047       -1     
+ Partials        296      295       -1     

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