learning by https://picklenerd.github.io/pngme_book/introduction.html
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隐藏数据
cargo run -- encode WechatIMG49.png -c loVe -m "i love you ❤️" -o shadow.png
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解码隐藏数据
cargo run -- decode shadow.png -c loVe # output i love you ❤️
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删除隐藏数据
cargo run -- remove shadow.png -c loVe # output `loVe` message removed