[fix] last not of: fix start parameter was ignored

[biojppm]

No description provided.

[codecov]

Codecov Report

Merging #62 (43367ce) into master (31a1443) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   92.95%   93.02%   +0.07%     
==========================================
  Files          50       50              
  Lines       10002    10107     +105     
==========================================
+ Hits         9297     9402     +105     
  Misses        705      705              

Impacted Files	Coverage Δ
src/c4/substr.hpp	98.84% <100.00%> (+0.01%)	⬆️
test/test_substr.cpp	99.20% <100.00%> (+0.02%)	⬆️

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