typedef struct Group Group;typedef struct Groups Groups; struct Group {	u32int id;	char *name;	Group *memb;	int nmemb;}; struct Groups {	char *raw;	Group *g;	int ng;}; int loadgroups(Groups *gs, char *raw);void freegroups(Groups *gs);Group *findgroup(Groups *gs, char *name, u32int *id);Group *findgroupid(Groups *gs, u32int id);int ingroup(Group *g, u32int id);