question: public static Set < String > createCharGramsShingles ( String text ) { Set < String > shingles = new HashSet < > ( ) ; for ( int i = 0 ; i < text . length ( ) - CHAR_GRAM_LENGTH + 1 ; i ++ ) { String shingle = text . substring ( i , i + CHAR_GRAM_LENGTH ) ; shingles . add ( shingle ) ; } return shingles ; }
target:  converts a text into a number of "characters n-grams" shingles.