fix bug for jvm. we need to convert the perr pubkey string to binary buffer first

Author: zoff99

jni-c-toxcore/jni-c-toxcore.c

@@ -8525,9 +8525,20 @@ Java_com_zoffcc_applications_trifa_MainActivity_tox_1group_1send_1private_1messa
     const jsize plength = (*env)->GetArrayLength(env, stringJbytes);
     jbyte* pBytes = (*env)->GetByteArrayElements(env, stringJbytes, NULL);
 
-    dbg(9, "tox_group_send_private_message_by_peerpubkey:DEBUG:group_number=%d type=%d pBytes1=%s pBytes=%s", (int)group_number, type, pBytes1, pBytes);
 
-    res = tox_group_send_private_message_by_peerpubkey(tox_global, (uint32_t)group_number, (const uint8_t *)pBytes1, (int)type,
+    unsigned char peer_public_key_bin[TOX_PUBLIC_KEY_SIZE];
+    char *peer_public_key_string2 = NULL;
+    const char *s = NULL;
+
+    peer_public_key_string2 = strdup(pBytes1);
+    toxpk_hex_to_bin(peer_public_key_bin, peer_public_key_string2);
+
+    if(peer_public_key_string2)
+    {
+        free(peer_public_key_string2);
+    }
+
+    res = tox_group_send_private_message_by_peerpubkey(tox_global, (uint32_t)group_number, (const uint8_t *)peer_public_key_bin, (int)type,
                                            (const uint8_t *)pBytes,
                                            (size_t)plength, &error);