Use path/filepath instead of path

[hiroebe]

path/filepath should be used instead of path when we handle file paths. Also, I replaced deprecated io/ioutil package.

[codecov[bot]]

Codecov Report

Merging #82 (d495466) into main (cbf197b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   88.29%   88.29%           
=======================================
  Files           3        3           
  Lines         615      615           
=======================================
  Hits          543      543           
  Misses         54       54           
  Partials       18       18           

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[seachicken]

Nice! Thank you