Fix: fixed iterations for bp decoder and added additional tests

[krishna-praneet]

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• All new functionality is tested.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.52%. Comparing base (6c6cb2d) to head (0471ee7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   42.30%   42.52%   +0.21%     
==========================================
  Files          13       13              
  Lines         468      468              
==========================================
+ Hits          198      199       +1     
+ Misses        270      269       -1     

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