#include <stdio.h>
#include <stdlib.h>

extern char* sub_string(char*, int, int);

int main(int argc, char** argv) {
	char* in_string = malloc(sizeof(char) * 128);
	printf("Enter a string: ");
	scanf("%s", in_string);

	int start = -1;
	printf("Enter the start index: ");
	scanf("%d", &start);

	int end = -1;
	printf("Enter the end index: ");
	scanf("%d", &end);


	char* out_string;
	out_string = sub_string(in_string, start, end);

	printf("The substring of the given string is '%s'\n", out_string);

	return 0;
}