// Program to test solutions to problem #8 on the cse142 midterm, autumn 2014.
// Fill in your solution to undouble, then compile and run the program.

import java.util.*;

public class Test8 {
    public static String undouble(String s) {
        // fill in your solution here
        // you can also rename the parameter above
    }

    // this is the sample solution
    public static String undouble2(String s) {
	String result = "";
	if (s.length() > 0) {
	    char last = s.charAt(0);
	    result += last;
	    for (int i = 1; i < s.length(); i++) {
		if (s.charAt(i) != last) {
		    result += s.charAt(i);
		}
		last = s.charAt(i);
	    }
	}
	return result;
    }

    private static int count, failCount;

    public static void main(String[] args) {
	test("");
        test("a");
        test("aa");
        test("ab");
        test("aab");
        test("aabb");
	test("odegaard");
	test("bookkeeper");
	test("baz");
	test("foobar");
	test("mississippi");
	test("apple");
	test("carry");
	test("berry");
        test("aardvark");
        test("glass");
        test("committment");
	test("juggle");
	test("little");
	test("cac");
	test("theses");
	test("ccaatt");
        test("aabbccddeeffgg");

        if (failCount == 0) {
            System.out.println("passed all tests");
        } else {
            System.out.println("failed " + failCount + " of " + count +
                               " tests");
        }
    }

    public static void test(String s) {
        count++;
        System.out.println("testing \"" + s + "\"");
	String s2 = undouble2(s);
        System.out.println("expected = \"" + s2 + "\"");

	String s1 = "";
        boolean fail = false;
	try {
	    s1 = undouble(s);
        } catch (RuntimeException e) {
            int line = e.getStackTrace()[1].getLineNumber();
            System.out.println("threw " + e + " at line #" + line);
            fail = true;
        }
        if (!fail && !s1.equals(s2)) {
            System.out.println("actual   = " + s1);
            fail = true;
        }
        if (fail) {
            System.out.println("failed");
            failCount++;
        } else {
            System.out.println("passed");
        }
        System.out.println();
    }
}