question: public String toSpacedString ( ) { final String original = toString ( ) ; final StringBuilder builder = new StringBuilder ( ) ; for ( int i = 0 ; i < original . length ( ) ; i ++ ) { if ( i > 0 && ( i % 4 ) == 0 ) builder . append ( ' ' ) ; builder . append ( original . charAt ( i ) ) ; } return builder . toString ( ) ; }
target:  Return a spaced fingerprint representation of this HexDigest.  ex: 1E0F 5874 2268 E82F C600 D81D 9064 07C5 7CC2 C3A7