Implement the substr() function in C

Here is a C program which implements the substr() function in C.
int main()
{
char str1[] = "India";
char str2[25];
substr(str2, str1, 1, 3);
printf("\nstr2 : [%s]", str2);
return(0);
}
substr(char *dest, char *src, int position, int length)
{
dest[0]='\0';
strncat(dest, (src + position), length);
}