Add LongestCommonPrefix.java

[TheDarkW3b]

• [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

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.31%. Comparing base (84522ba) to head (dd22e1e).

Files with missing lines	Patch %	Lines
...com/thealgorithms/strings/LongestCommonPrefix.java	90.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5849      +/-   ##
============================================
+ Coverage     72.30%   72.31%   +0.01%     
- Complexity     4959     4965       +6     
============================================
  Files           650      651       +1     
  Lines         17552    17562      +10     
  Branches       3384     3385       +1     
============================================
+ Hits          12691    12700       +9     
  Misses         4383     4383              
- Partials        478      479       +1     

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[TheDarkW3b]

Let me know if any changes are required.. also please add the hacktoberfest label

[TheDarkW3b]

Let me know if any changes are required.. also please add the hacktoberfest label