if [ ! -d "alg" ]; then
git clone https://github.com/cubing/alg.js alg
fi
if [ ! -d "kpuzzle" ]; then
git clone https://github.com/cubing/kpuzzle.js kpuzzle
fi
if [ ! -d "twisty" ]; then
git clone https://github.com/cubing/twisty.js twisty