Add quit to test shutdown works; empty command to not send presence.

examples/send-presence/send-presence.c

@@ -68,6 +68,10 @@ static void gameLoop()
 
     printf("You are standing in an open field west of a white house.\n");
     while (prompt(line, sizeof(line))) {
+        if (line[0]) {
+            if (line[0] == 'q') {
+                break;
+            }
             if (time(NULL) & 1) {
                 printf("I don't understand that.\n");
             }
@@ -82,6 +86,7 @@ static void gameLoop()
             ++FrustrationLevel;
 
             updateDiscordPresence();
+        }
 
 #ifdef DISCORD_DISABLE_IO_THREAD
         Discord_UpdateConnection();