哈希表不会删除

Question

  

我正在尝试进行这3种操作，添加，删除和搜索。但是，当我尝试删除某些值不起作用时，我想知道我在此函数中做错了什么，和/或是否正确编写了其他函数。这是整个代码。   如果我尝试两次删除相同的值：free（）：在tcache 2中检测到double free

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define size_table 10

typedef struct Citizen citizen;
typedef struct Citizen{
  char name[20];
  int age;
  citizen *next;
  citizen *table[size_table];
} citizen;

int hash_function(int age){
  return 10 - 2 - age % (size_table-2);
}

citizen *hash_add(citizen *tab, int age, char *name){
  int position = hash_function(age);
  citizen *new_citizen = (citizen*)malloc(sizeof(citizen));

  new_citizen->next = tab->table[position];
  new_citizen->age = age;
  strcpy(new_citizen->name,name);
  tab->table[position] = new_citizen;

  return new_citizen;
}

citizen *hash_search(citizen *tab, int age){
  int position = hash_function(age);
  citizen *new_search = tab->table[position];

  while(new_search != NULL){
    if(new_search->age == age) return new_search;
    new_search = new_search->next;
  }
  return NULL;
}

void hash_delete(citizen *tab, int age){

  int position = hash_function(age);
  citizen *new_delete = hash_search(tab,age);
  new_delete = tab->table[position];
  free(new_delete);
}

void clean_screen(){ system("clear"); }

void menu(){
     "\033[0;32mi -Insert \n" 
     "\033[0;33mr -Remove \n"
     "\033[0;34ms -Search \n"
     );
}

int main(){
  clean_screen();
  menu();

  citizen ct;
  int age;
  char get_name;

  char choice;
  while(scanf("%c",&choice) != EOF){
    switch(choice){
    case 'i':
      clean_screen();
      printf("Insira a idade: ");
      scanf("%d",&age);
      printf("Insira o nome: ");
      scanf("%c ",&get_name);
      hash_add(&ct,age,&get_name);

      printf("Elemento adicionado ");
      clean_screen();
      menu();
      break;

    case 'r':
      clean_screen();
      printf("Remover a idade: ");
      scanf("%d",&age);
      hash_delete(&ct, age);
      clean_screen();
      menu();

      break;

    case 's':
      clean_screen();
      printf("Digite a idade: ");
      scanf("%d",&age);
      citizen *get_search = hash_search(&ct,age);
      clean_screen();
      if(get_search != NULL) printf("Idade %d encontrada\n", age);
      else  printf("idade %d não exise\n",age);

      menu();
      break;
    }
  }
  return 0;
}