Update TODO
Beautify
Suppress error
Update docstring, header, footer
Refactorring
Add examples

char-to-string
charset-plist
charset-priority-list
charsetp
cl-coerce
coding-system-get
coding-system-list
coding-system-p
coerce
downcase
f-join
macroexpand
macroexpand-all
make-char
make-list
s-format
split-char
symbol-name
upcase
while
Save example of a particular key with the command

Example:
    M-x ex-store-key-example RET symbol-name
    ↓
    elisp-examples.elにsymbol-nameの実行例を保存する。実行例はキーとなる
    関数を探して、上書きする処理になっている。
Update "Commentary:" position
Update (ex-example)

Add ex-begin-comment
Update ex-key-exists-p
Remove (ex-examples)
Update tests
Rename run-test.el to test-helper.el
Minor update
Update README.md
Update examples
Enable local variables
Makefile use Cask and ert-runner
Update dependendency
Beautify and remove comments