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This is a sample program that demonstrates how to use the strings utility:
#include <stdio.h>
#include "strings.h"
int main(int argc, char **argv) {
printf("Hello World");
str s;
s = "Hello world";
printf("\n%s", s);
printf("\n%d", indexof(s, 'H'));
printf("\n%d", nindexof('H'));
printf("\n%d", lindexof(s, 'H'));
printf("\n%s", substr(s, 4));
printf("\n%s", nsubstr(s, 4, 5));
return 0;
}