Is any extension in Emacs can shrink and expand a block of code

[Qiang Yu]

Hi all,

Is there any extension in Emacs can shrink and expand a block of code?

For example:

int foo()
{
    return 0;
}

the content in "{}" can be shrunk to like:

int foo()
{...}

and I can expand it back.

Regards,
yuq