Add comments in function get_mb_id.

The function can now be fed an artist name to be placed in the
MusicBrainz query string. This will allow it to be used in a loop in the
future.

get_artist_art.c

@@ -1,13 +1,15 @@
-#include <libconfig.h>
-#include <unistd.h>
 #include <curl/curl.h>
+#include <libconfig.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
+#define version_str "1.0"
 #define conf_file "config.ini"
-#define mb_url "https://musicbrainz.org/ws/2/artist?query=artist:\"Slayer\"&fmt=json"
+#define mb_url                                                                 \
+  "https://musicbrainz.org/ws/2/artist?query=artist:\"%s\"&fmt=json"
 
-const char *get_conf_str(char set_key[10]) {
+const char *get_conf_str(char set_key[]) {
   const char *prog_conf = malloc(10 * sizeof(char));
   config_t cfg;
   config_setting_t *setting;
@@ -29,7 +31,7 @@ const char *get_conf_str(char set_key[10]) {
   return prog_conf;
 }
 
-int get_conf_int(char set_key[10]) {
+int get_conf_int(char set_key[]) {
   int set_int;
   config_t cfg;
   config_setting_t *setting;