#include <stdio.h>
#define N 10
char* Sub_String(char p1[], int p2, int p3)
{
    static char subsrting[N];
    int l = p2 + p3;
    for (int i = p2; i < l; i++)
    {
        subsrting[i - p2] = p1[i];
    }
    return subsrting;
}
void main(void)
{
    char string[N] = "abcdefghij";
    char *ptr;
    ptr = Sub_String(string, 1, 3);
    int i = 0;
    while (*(ptr + i) != '\0')
    {
        printf("%c", *(ptr + i));
        i++;
    }
    getch();
}