Combine with the old capitalizeFirstLetter

[w3nl]

cleaner methods, smaller scopes

[codecov]

Codecov Report

Merging #5 (3460600) into main (6d03bbb) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 3460600 differs from pull request most recent head 8e471bd. Consider uploading reports for the commit 8e471bd to get more accurate results

@@            Coverage Diff            @@
##              main        #5   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           17        19    +2     
  Branches         2         2           
=========================================
+ Hits            17        19    +2     

Impacted Files	Coverage Δ
src/string-helper.js	100.00% <100.00%> (ø)

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