return_by_value.c

// Allowed manner of interacting with arrays
// where returning an array by value from a function isn't allowed
unsigned char buffer[10];

// pass in a pointer to the initialized array you want to mutate
void hiBuffer(unsigned char *buff){
    buff[0] = 'h';
    buff[1] = 'i';
};

// But returning by value a struct is allowed...!
struct Person { int age;};

struct Person getThirtyYo(void){
    struct Person p = {30}; 
    return p;
}