Revert "【全体】　コミットの練習　その１"

This reverts commit ff14f0da41bf346222ed2802f7d89c506f241b25.
Revert "Revert "【全体】　コミットの練習　その１""

This reverts commit 2335e6f2bc30e46ce74f27f55968b7f1185420c4.