git.c: simplify stripping extension of a file in handle_builtin()
The handle_builtin() starts from stripping of command extension if STRIP_EXTENSION is enabled. Actually STRIP_EXTENSION does not used anywhere else. This patch introduces strip_extension() helper to strip STRIP_EXTENSION extension from argv[0] with the strip_suffix() instead of manually stripping. Signed-off-by: NAlexander Kuleshov <kuleshovmail@gmail.com> Helped-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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