Update SinglyLinkedList.java

[gulu375]

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Added a poll() function that:

• Returns the head(first node) isolated and removes it from Linked-List
• Updates the size of Linked-List
• Throws NoSuchElementException if Linked-List is empty

• [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.
• [ ] 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

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 40.03%. Comparing base (208e1e9) to head (5f1c694). Report is 46 commits behind head on master.

Files	Patch %	Lines
...orithms/datastructures/lists/SinglyLinkedList.java	0.00%	7 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5270      +/-   ##
============================================
- Coverage     40.07%   40.03%   -0.04%     
  Complexity     2464     2464              
============================================
  Files           519      519              
  Lines         15479    15486       +7     
  Branches       2954     2954              
============================================
- Hits           6203     6200       -3     
- Misses         8986     8995       +9     
- Partials        290      291       +1     

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[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution!