c语言中的popen函数存在一个潜在的问题

    #include<stdio.h>
    #include<string>
    #include<cstdlib>
    #include<iostream>
    using namespace std;
    int main()
    {
     FILE *fp = NULL;
     char name[100] = {'0'};
     fp = popen("whoami", "r");
     if (fp == NULL)
     {
      printf("popen error!\n");
      return 1;
     }
     while (fgets(name, sizeof(name), fp) != NULL);
     pclose(fp);
     fflush(stdin);
     fflush(stdout);
     string operate = "mkdir ";
     string operName = name;
     operate = operate + operName;
     system((char*)operate.c_str());
     char filename[100]