Added GPL message to inlines.c

src/inlines.c

@@ -1,3 +1,20 @@
+/*
+   ncdg - A program to help generate natechoe.dev
+   Copyright (C) 2022  Nate Choe (natechoe9@gmail.com)
+
+   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 <https://www.gnu.org/licenses/>.
+ */
 #include <ctype.h>
 #include <string.h>