remove unused files and clean up codebase

src/lib.h

@@ -1,21 +1,3 @@
-/*
- * mpxgen - FM multiplex encoder with Stereo and RDS
- * Copyright (C) 2021 Anthony96922
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
 extern void msleep(unsigned long ms);
 
 extern size_t _strnlen(const char *s, size_t maxlen);
@@ -26,5 +8,4 @@ extern char *get_rtp_tag_name(uint8_t rtp_tag);
 extern void add_checkwords(uint16_t *blocks, uint8_t *bits);
 extern uint8_t add_rds_af(struct rds_af_t *af_list, float freq);
 extern char *show_af_list(struct rds_af_t af_list);
-extern uint16_t crc16(uint8_t *data, size_t len);
 extern unsigned char *xlat(unsigned char *str);