【C 语言练习】判断子串个数？

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define L 50
#define l 5

int main()
{
  int i, j, sLen, subStrLen;
  char s[L] = "abcdefabcjkabcabc";
  char subStr[l] = "abc";
  // scanf("%s%s", s, subStr);
  // printf("%s\n%s\n", s, subStr);
  // printf("%d\n%d\n", strlen(s), strlen(subStr));
  i = j = 0;
  int c = 0;
  while(i < strlen(s))
  {
    while(s[i++] != subStr[0] && i < strlen(s));
    i -= 1;
    if(s[i] == subStr[0])
    {
      while(s[i++] == subStr[j++] && i < strlen(s) && j < strlen(subStr));
      if(j == strlen(subStr))
      {
        c += 1;
      }
      j = 0;
    }
  }
  printf("%d\n", c);
  return 0;
}