Measure a Mixed Struct

The boilerplate defines: ``c struct Record { char kind; long amount; char flag; }; ` Implement, **without naming any hard-coded sizes in the answer's logic** (use the operators, not magic numbers): `c /* offset of each member, as actually compiled */ size_t rec_kind_off(void); size_t rec_amount_off(void); size_t rec_flag_off(void); /* total compiled size */ size_t rec_size(void); /* how many Records fit in a buffer of n bytes (n/sizeof, floor; 0 if n < size) */ size_t rec_capacity(size_t n); ``

Difficulty: intermediate