I call git get the toplevel dir (according to Is there a way to get the git root directory in one command? ).
(let ((tmpbuffer (get-buffer-create (make-temp-
If You are OK with awesome external package.
use s-trim
ELISP> (shell-command-to-string "light -G") "60.00\n" ELISP> (s-trim (shell-command-to-string "light -G")) "60.00"