Improve BufferedReader

[Shantanu675]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in BufferedReader.
• 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 algorithms include a corresponding test class that validates their functionality.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.52%. Comparing base (1edf319) to head (120f3bc).

Files with missing lines	Patch %	Lines
...main/java/com/thealgorithms/io/BufferedReader.java	90.00%	0 Missing and 1 partial ⚠️
...om/thealgorithms/sorts/RecursiveInsertionSort.java	94.11%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7373      +/-   ##
============================================
+ Coverage     79.50%   79.52%   +0.02%     
- Complexity     7142     7150       +8     
============================================
  Files           796      797       +1     
  Lines         23368    23387      +19     
  Branches       4596     4598       +2     
============================================
+ Hits          18578    18598      +20     
+ Misses         4050     4049       -1     
  Partials        740      740              

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