Lenght -> Length

Change-Id: Ic338484627a1b74fba2d4d0794f8865290177464
emptyness -> emptiness

Change-Id: Id04bea1d07735511acb6d29c96c46d4dea222c0c
widht -> width

Change-Id: I661eeb167a95540a223ce72aac51789daf3767dc