text: typedef struct hash *HashTable;
  typedef struct node *citizenRecord;
  
  char *getId(citizenRecord );
  char *getFirstName(citizenRecord );
  char *getLastName(citizenRecord );
  char *getCountry(citizenRecord );
  int getAge(citizenRecord );
  
  HashTable htCreate(int );
  citizenRecord htSearchOrInsert(HashTable ,char *,char *,char *,char *,int );
  citizenRecord htSearch(HashTable ,char *);
  void htDestroy(HashTable );
  