question: public String concatenate ( String start , List < String > chunks ) { StringBuffer buf ; if ( start == null ) { buf = new StringBuffer ( ) ; } else { buf = new StringBuffer ( start ) ; } if ( chunks != null ) { for ( String chunk : chunks ) { if ( chunk != null ) { buf . append ( chunk ) ; } } } return ( buf . length ( ) == 0 ) ? null : buf . toString ( ) ; }
target:  Concatenates a single String and a List of String into a single long String.