[Rishavbhattarai]

SkipList.remove runs size-- even when the element is not in the list. Removing from an empty list makes size() return -1, and removing a missing element from a non-empty list makes the size one too small.

When the search does not find the element it ends with layer == -1. The fix returns at that point.

• 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. (No new algorithm.)
• All new algorithms include a corresponding test class that validates their functionality. (Regression test added.)
• 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 82.20%. Comparing base (96ed2d7) to head (b304f9f).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7666   +/-   ##
=========================================
  Coverage     82.20%   82.20%           
- Complexity     8397     8399    +2     
=========================================
  Files           843      843           
  Lines         26133    26135    +2     
  Branches       5097     5098    +1     
=========================================
+ Hits          21482    21484    +2     
- Misses         3859     3860    +1     
+ Partials        792      791    -1     

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