[Beginner Question]Where can I get the source of hstore?

[Wen Yi <chuxuec@xxxxxxxxxxx>]

Hi community,

I want to do some research on the hstore,but I can't find its source.

(My postgres distribution doesn't come with this extension)

I have looked it up in github,but gained nothing.

Can anyone provide me a copy of its code?Or just give a link to me?

Thanks in advance!

Yours,

BeginnerC.