text: #ifndef CLIENT_H
  #define CLIENT_H
  
  #include <stdbool.h>
  #include "data.h"
  
  /**
   * Perform a query from the client to the server.
   *
   * @param q [in] The string to query on the server.
   * @return A Person strunct recording the result of query. On failure, NULL is
   *         returned.
   */
  Person *client_query(const char *q);
  
  bool client_add(Person *person);
  
  bool client_edit(const char *name, Person *person);
  
  #endif
  