struct person
{
  char * name;
  int age;
};


int string_length(char * my_string);
char * copy_string(char * input);
struct person input_person();
void print_person(char * name, struct person p1);
struct person copy_person(struct person p1);

void foo(struct person p1);
void foo2(struct person p1);
void foo3(struct person * p1);