Function to fix the issue of returning the reference sequence in a pairwise alignment.

[Susu26]

Fix #55.

[kescobo]

Thanks for the contribution! Would you please add a test for this function as well?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.22%. Comparing base (ceb3fe6) to head (8d7ce92).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
- Coverage   88.72%   88.22%   -0.51%     
==========================================
  Files          17       16       -1     
  Lines        1224     1180      -44     
==========================================
- Hits         1086     1041      -45     
- Misses        138      139       +1     

Flag	Coverage Δ
unittests	88.22% <100.00%> (?)

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