Move some utils to new modules

src/Data/Char/Local.hs

@@ -0,0 +1,24 @@
+{- This file is part of Vervis.
+ -
+ - Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
+ -
+ - ♡ Copying is an act of love. Please copy, reuse and share.
+ -
+ - The author(s) have dedicated all copyright and related and neighboring
+ - rights to this software to the public domain worldwide. This software is
+ - distributed without any warranty.
+ -
+ - You should have received a copy of the CC0 Public Domain Dedication along
+ - with this software. If not, see
+ - <http://creativecommons.org/publicdomain/zero/1.0/>.
+ -}
+
+module Data.Char.Local
+    ( isAsciiLetter
+    )
+where
+
+import Prelude
+
+isAsciiLetter :: Char -> Bool
+isAsciiLetter c = 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z'