SSL_group_to_name - get name of group
 #include <openssl/ssl.h>
 const char *SSL_group_to_name(const SSL *ssl, int id);
SSL_group_to_name() is used to retrieve the TLS group name associated
  with a given TLS group ID, as registered via built-in or external providers
  and as returned by a call to SSL_get1_groups() or
  SSL_get_shared_group().
If non-NULL, SSL_group_to_name() returns the TLS group name corresponding
  to the given id as a NUL-terminated string. If
  SSL_group_to_name() returns NULL, an error occurred; possibly no
  corresponding tlsname was registered during provider initialisation.
Note that the return value is valid only during the lifetime of
    the SSL object ssl.
Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License").
    You may not use this file except in compliance with the License. You can
    obtain a copy in the file LICENSE in the source distribution or at
    <https://www.openssl.org/source/license.html>.