我正在尝试释放一个二维字符数组，但是当我用fsanitize=address编译并运行程序时，出现了内存泄漏。看起来代码free(innerArray)并没有释放单个字符数组。有什么想法吗？

struct Item {
    char* line;
    struct Item *next;
};

void mainMethod(Item *firstArgument) {
   // Create 2d array
  int r = 5; // r gets some number 
  char **myargs = malloc((r+1)* sizeof(char *));
  myargs[0] = malloc((strlen(command)+1) * sizeof(char));
  myargs[0] = command;
  int i = 1;
  struct Item* arg = firstArgument->next;
  for ( ; i < r; i++) {
    myargs[i] = malloc(((strlen(arg->line)+1)*sizeof(char)));
    strcpy(myargs[i], arg->line);
    arg = arg->next;
  }
  myargs[i] = NULL;

  // do processing ...

  // Free 2d array
  int i = 0;
  while (i <= r) {
    char* innerArr = arr[i];
    free(innerArr);
    i++;
  }
  free(arr);
}