Merge branch 'eopl' into sicp
unused tex file
ex 3.5 - done
ex 4.5 - make `cond->if` work
ex 4.4.b - previous approach is wrong, fixed
refactor cond->if
ex 4.5 - done
ex 3.8 - done
ex 3.9 - impl done
ex 3.9 - done
fix script
ex 3.10 - done
ex 3.11 - done
ex 3.12 - done
ex 4.6 - done
ex 4.7 - done
ex 4.8 - not working
ex 4.8 - testcases
some automate test for ex 4.6
ex 4.8 - simplified a little