first commit.
add unittest
hash map API design
final
add sblv0
Add 'oldsbl/v1/' from commit 'c26d7d590009ae304f3319481006acf4f2bc9292'

git-subtree-dir: oldsbl/v1
git-subtree-mainline: 7d21289ed474b54c96b5259b05c13e8644b4bcea
git-subtree-split: c26d7d590009ae304f3319481006acf4f2bc9292