/**
 * CS 149 Exercise 6.2 CodingBat String-2.
 *
 * @author
 * @version
 */
public class BatString2 {

   /**
    * Given a string, return a string where for every char in the original,
    * there are two chars.
    *
    * @param str input string
    * @return result string
    */
   public static String doubleChar(String str) {
   }

   /**
    * Return true if the string "cat" and "dog" appear the same number of times
    * in the given string.
    *
    * @param str input string
    * @return result boolean
    */
   public static boolean catDog(String str) {
   }

}