Write a method called compress that takes a string as input, compresses it using rle, and returns the compressed string. case matters - uppercase and lowercase characters should be considered distinct. you may assume that there are no digit characters in the input string. there are no other restrictions on the input - it may contain spaces or punctuation. there is no need to treat non-letter characters any differently from letters.

public static String compress (String original) { StringBuilder compressed = new StringBuilder (); char letter = 0; int count = 1; for (int i = 0; i < original. length (); i++) { if (letter = = original. charAt (i)) { count = count + 1; } else { compressed = count!=1? compressed. append (count) : compressed; compressed. append (letter); letter = original. charAt (i); count = 1; } } compressed = count!=1? compressed. append (count) : compressed; compressed. append (letter); return compressed. toString (); }