Example 2: remove blanks
// Return a copy of s, but with blanks removed
public static String removeBlanks (String s) {
if (s.length() == 0) return s;
if (s.charAt(0) == � �) return removeBlanks(s.substring(1));
// first character of s is not a blank.
// Return first character followed by rest of s
// but with blanks removed
return s.charAt(0) + removeBlanks(s.substring(1));