forgot util project in prior commit

README.md

@@ -11,6 +11,7 @@ https://github.com/matyb/java-koans/archives/master
     * *lib/koans-tests*: the directory for tests to check the sanity of the application
     * *lib/file-compiler*: the dynamic compiler module that loads newly saved java files into the JVM as classes
     * *lib/file-monitor*: the file monitoring module for notifying the app when files are saved 
+    * *lib/util*: application agnostic interfaces and utilities shared in projects
 * Change directory to the koans directory: ```cd koans```
 * If you are using windows enter: ```run.bat``` or ```sh run.sh``` if you are using Mac or Linux.
 

koans/README.md

@@ -11,6 +11,7 @@ https://github.com/matyb/java-koans/archives/master
     * *lib/koans-tests*: the directory for tests to check the sanity of the application
     * *lib/file-compiler*: the dynamic compiler module that loads newly saved java files into the JVM as classes
     * *lib/file-monitor*: the file monitoring module for notifying the app when files are saved 
+    * *lib/util*: application agnostic interfaces and utilities shared in projects
 * Change directory to the koans directory: ```cd koans```
 * If you are using windows enter: ```run.bat``` or ```sh run.sh``` if you are using Mac or Linux.
 

lib/util/src/com/sandwich/util/ExceptionUtils.java

@@ -0,0 +1,17 @@
+package com.sandwich.util;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+public class ExceptionUtils {
+
+	public static String convertToPopulatedStackTraceString(Throwable t) {
+		StringWriter stringWriter = new StringWriter();
+		if(t == null){
+			return "";
+		}
+		t.printStackTrace(new PrintWriter(stringWriter));
+		return stringWriter.toString();
+	}
+
+}

lib/util/src/com/sandwich/util/io/ui/DefaultErrorPresenter.java

@@ -0,0 +1,10 @@
+package com.sandwich.util.io.ui;
+
+public class DefaultErrorPresenter implements ErrorPresenter {
+
+	@Override
+	public void displayError(String error) {
+		System.err.println(error);
+	}
+
+}

lib/util/src/com/sandwich/util/io/ui/ErrorPresenter.java

@@ -0,0 +1,7 @@
+package com.sandwich.util.io.ui;
+
+public interface ErrorPresenter {
+
+	void displayError(String error);
+
+}