refactor: rename public methods for certain consistency

[ilyar]

#16

[codecov]

Codecov Report

Merging #20 into master will increase coverage by 3.42%.
The diff coverage is 82.14%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   90.32%   93.75%   +3.42%     
==========================================
  Files           6        8       +2     
  Lines         124      160      +36     
==========================================
+ Hits          112      150      +38     
+ Misses         11        6       -5     
- Partials        1        4       +3

Impacted Files	Coverage Δ
api/logger.go	100% <ø> (ø)
cmd/template/template.go	100% <ø> (ø)	⬆️
cmd/document/pdf.go	95.12% <100%> (ø)	⬆️
api/routers.go	100% <100%> (ø)	⬆️
api/server.go	100% <100%> (+100%)	⬆️
util/os.go	100% <100%> (ø)	⬆️
api/handlers.go	69.23% <61.53%> (ø)

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