Keep the audio file inside a folder "sounds"
char *audio_path = "sounds/";
then compile and run the 'updateDatabase.c' file gcc -o updateDB updateDatabase.c and ./updateDB , this will create a SQLite DB file called file_data.db that contains the audio files meta data

After that run the main server

gcc clrfnc.c dbfnc.c fileio.c stdfnc.c main.c -o MainServer -lsqlite3
./MainServer

if (strcmp(req->route, "/files") == 0) this route /files respond back a JSON contains the audio file id and file name ,

[{"FA37jNCchRYdSBZA":"file name"}]

use this route /audio/:id , the id is from the JSON and this route will respond back with base64 encoded string of audio file corresponded to the audio id

apache benchmark result for 1000 cuncurrent request

Valgrind summary about memory leaks