All emoji are garbled in ja/Day19.md

[Sakatoku]

All emoji in the sample code on Day 19 of the Japanese version are garbled.
All emoji have been replaced by '??'.
To see the content delivered at July 19, 2023, please check the attached file.

P.S.
The correct content in English version is as follows:

[dataprofessor]

Thanks for the suggestion, corrections have been implemented in this PR #4