question: public AbstractTreePrinter removeLastChar ( ) { if ( out . length ( ) == 0 ) { return this ; } if ( out . charAt ( out . length ( ) - 1 ) == '\n' ) { currentLine -- ; currentColumn = 0 ; } else { currentColumn -- ; } out . deleteCharAt ( out . length ( ) - 1 ) ; return this ; }
target:  Removes the last output character.