/**
 * 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) {
    }

}