question: private static String mungeCharName ( String source ) { StringBuffer buf = new StringBuffer ( ) ; for ( int i = 0 ; i < source . length ( ) ; ) { int ch = UTF16 . charAt ( source , i ) ; i += UTF16 . getCharCount ( ch ) ; if ( UCharacterProperty . isRuleWhiteSpace ( ch ) ) { if ( buf . length ( ) == 0 || buf . charAt ( buf . length ( ) - 1 ) == ' ' ) { continue ; } ch = ' ' ; } UTF16 . append ( buf , ch ) ; } if ( buf . length ( ) != 0 && buf . charAt ( buf . length ( ) - 1 ) == ' ' ) { buf . setLength ( buf . length ( ) - 1 ) ; } return buf . toString ( ) ; }
target:  Remove leading and trailing rule white space and compress internal rule white space to a single space character.