求字符串的子串

#include<stdio.h>


#define N 7

int main() {
    
    char str[] = "abadegb";

    char *pStr = str;

    int i = 0;
    int j = 0;
    int k = 0;

    for(i = 0; i < N; i++) {

        for(j = 1; j <= N-i; j++) {

            while(k < j) {

              k++;
              printf("%c",*(pStr+i));
              pStr++;

            }
            
            k = 0;
            pStr = str;
            printf("\n");
        }
    }
}