Initial implementation of basic functionality

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
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# Date:      Wed Jul 8 11:09:12 2026 -0500
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# On branch master
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# Initial commit
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# Changes to be committed:
#	new file:   .gitignore
#	new file:   Makefile
#	new file:   README
#	new file:   TODO
#	new file:   base.c
#	new file:   config.mk
#	new file:   merge.c
#	new file:   okra.h
#	new file:   test/all
#	new file:   test/base.c
#	new file:   test/merge.c
#	new file:   test/okra.c
#
