fix: longest homopolymer needs to be case insensitive

[nh13]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.35%. Comparing base (3fa7a48) to head (5e73b30).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #181   +/-   ##
=======================================
  Coverage   89.35%   89.35%           
=======================================
  Files          18       18           
  Lines        2094     2094           
  Branches      464      464           
=======================================
  Hits         1871     1871           
  Misses        146      146           
  Partials       77       77           

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