code: public function contactRename($contact, $firstName, $lastName)
      {
          $contact   = $this->escapePeer($contact);
          $firstName = $this->escapeStringArgument($firstName);
          $lastName  = $this->escapeStringArgument($lastName);
  
          return $this->exec('rename_contact ' . $contact . ' ' . $firstName . ' ' . $lastName);
      }
docs: Renames a user in the contact list
  
  @param string $contact   The contact, gets escaped with escapePeer(),
  so you can directly use the values from getContactList()
  @param string $firstName The new first name for the contact
  @param string $lastName  The new last name for the contact
  
  @return string|boolean The renamed contact "$firstName $lastName"; false if somethings goes wrong
  
  @uses exec()
  @uses escapeStringArgument()