making code more clean and readable

[abdala-elgendy]

• 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

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 39.82%. Comparing base (a5b4c61) to head (25c8244).

Files	Patch %	Lines
...algorithms/datastructures/heaps/FibonacciHeap.java	25.00%	3 Missing ⚠️
...om/thealgorithms/datastructures/heaps/MaxHeap.java	0.00%	1 Missing ⚠️
...om/thealgorithms/datastructures/heaps/MinHeap.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5251   +/-   ##
=========================================
  Coverage     39.82%   39.82%           
  Complexity     2436     2436           
=========================================
  Files           517      517           
  Lines         15476    15476           
  Branches       2958     2958           
=========================================
  Hits           6163     6163           
  Misses         9022     9022           
  Partials        291      291           

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[yanglbme]

LGTM, thanks :)