Digit Separation for large integer number added

[mjk22071998]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] 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 :white_check_mark:

Project coverage is 53.31%. Comparing base (de22158) to head (b233407).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5543      +/-   ##
============================================
+ Coverage     53.24%   53.31%   +0.06%     
- Complexity     3327     3333       +6     
============================================
  Files           530      531       +1     
  Lines         15356    15368      +12     
  Branches       2926     2928       +2     
============================================
+ Hits           8177     8193      +16     
+ Misses         6839     6837       -2     
+ Partials        340      338       -2     

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