https://github.com/naptha/tesseract.js#tesseractjs
https://qiita.com/kskinaba/items/3e8887d45b11f9132012
https://ashitani.jp/golangtips/tips_time.html
https://www.tweeeety.blog/entry/2017/08/17/021040
http://www.spinute.org/go-by-example/
https://www.programming-books.io/essential/go/
https://skatsuta.github.io/2015/12/29/value-receiver-pointer-receiver/
https://qiita.com/rtok/items/46eadbf7b0b7a1b0eb08
https://qiita.com/sh-tatsuno/items/0c32c01eaeaf2d726fdf
https://qiita.com/taiyo/items/d89cb99a52d9cea9b3de
https://github.com/chai2010/cgo
https://qiita.com/74th/items/0362bea2012ef253c539
https://gist.github.com/msh5/2dc2914fbc901b309511f7c9b95e3a46
https://gist.github.com/naoa/6777040
https://qiita.com/naoa/items/38df1cb153f2bd1c1628
https://qiita.com/a_yasui/items/f2d8b57aa616e523ede4