Hello guys, I have a question

If I have

file1.h
void* a(void);

file1.c
static int b(void)
{
return 1;
}

void* a(void)
{
return &b;
}

file2.c
void (*func)(void) = a();
int d = *func();



But there is an error int file2.c

How can I return and use static function by its pointer?