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Oftentimes, we'll want to refer to an empty tree or empty blob by its hex name without having to call oid_to_hex or explicitly refer to the_hash_algo. Add helper functions that format these values into static buffers and return them for easy use. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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