Shorter license header

Signed-off-by: Suki <suki@missallsunday.com>
Unused properties

Signed-off-by: Suki <suki@missallsunday.com>
more unused properties
also,  private ones should be avoided

Signed-off-by: Suki <suki@missallsunday.com>
Typo

Signed-off-by: Suki <suki@missallsunday.com>