stringhlib.c

#include "stdio.h"
#include <string.h>
int main () {
	
	char string1[40] = "this is a string";
	char string2[] = "so is this";
	
	int length = strlen(string1);
	printf("%d", length);
	strcat(string1, " ");
	strcat(string1, string2);
	printf("%s", string1);
	
	return 0;
}