How to access the resource of the book "Raspberry Pi Retail Applications"?

[Leon]

Hi,
I’m reading the book “Raspberry Pi Retail Applications” by Elaine Wu at Seeed. I cannot access the corresponding resource listed on the book, i.e., https://github.com/Apress/Raspberry-Pi-Retail-Applications. So I have to ask here for the answer.
Thanks.
您好，我正在阅读Seeed公司Elaine Wu所写的一本书《Raspberry Pi Retail Applications》，在书中的配书代码网址https://github.com/Apress/Raspberry-Pi Retail-Applications在github上无法查到。请帮助联系一下作者，好吗？
谢谢。
有消息的话，请发邮件至lzhang@fudan.edu.cn
Regards,
Leon