fix columnarTranspositionCipher and typos in Test

[SAIVARDHAN15]

…herTest

• 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 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 59.35%. Comparing base (029dd85) to head (761dd5e).

Files with missing lines	Patch %	Lines
...lgorithms/ciphers/ColumnarTranspositionCipher.java	71.42%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5649   +/-   ##
=========================================
  Coverage     59.35%   59.35%           
  Complexity     3796     3796           
=========================================
  Files           556      556           
  Lines         15927    15927           
  Branches       3040     3040           
=========================================
  Hits           9454     9454           
  Misses         6069     6069           
  Partials        404      404           

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[siriak]

Looks good, thanks!