#include<stdio.h>
#include<ctype.h>

void cap_string(char* s) {
	for( ; *s; s++)
		*s = toupper(*s);
}

void print_stretched(char *s){
	for( ; *s; s++)
		printf("%c ", *s);
	printf("\n");
}

void print_doubled(char *s){
	printf("%s%s\n", s, s);
}

struct string_operations {
	void (*capitalize)(char *);
	void (*print_nice)(char *);
};

void cap_and_print(char *s, struct string_operations *ops){
	ops->capitalize(s);
	ops->print_nice(s);
}

int main(){
	struct string_operations ops_a = {cap_string, print_doubled};
	struct string_operations ops_b = {cap_string, print_stretched};
	char s1[] = "foxes have holes";
	char s2[] = "There was a fox living under my friend's porch";
	cap_and_print(s1, &ops_a);
	cap_and_print(s2, &ops_b);
	return 0;
}