done

Crypto/src/ROT13Test.java → Crypto/Test/ROT13Test.java

 import org.junit.Test;
 
 import static org.junit.Assert.*;
+import org.testng.annotations.Test;
+
 
 public class ROT13Test {
 

Crypto/src/ROT13.java

 
     public String crypt(String text) throws UnsupportedOperationException {
 
-        return "";
+        StringBuilder sb = new StringBuilder();
+
+         for(int i = 0; i < text.length(); i++){
+             char c = text.charAt(i);
+
+             if (c >= 'a' && c <= 'm'){
+                    c += 13;
+             } else if (c >= 'A' && c <= 'M'){
+                    c += 13;
+             } else if (c >= 'n' && c <= 'z'){
+                    c -= 13;
+            } else if (c >= 'N' && c <= 'Z') {
+                    c -= 13;
+            }
+            sb.append(c);
+
+         }
+
+         return sb.toString();
+        }
     }
 
     public String encrypt(String text) {
-        return text;
+
+        return crypt(text);
     }
 
     public String decrypt(String text) {
-        return text;
+
+        return crypt(text);
     }
 
     public static String rotate(String s, Character c) {
 
-        return "";
+        int startIndex = s.indexOf(c);
+        StringBuilder sb = new StringBuilder();
+        sb.append(s.substring(startIndex, s.length()));
+        sb.append(s.substring(0, startIndex));
+        return sb.toString();
+
+
+//        String sonnet18 = "Shall I compare thee to a summer’s day?\n" +
+//                "Thou art more lovely and more temperate:\n" +
+//                "Rough winds do shake the darling buds of May,\n" +
+//                "And summer’s lease hath all too short a date;\n" +
+//                "Sometime too hot the eye of heaven shines,\n" +
+//                "And often is his gold complexion dimm'd;\n" +
+//                "And every fair from fair sometime declines,\n" +
+//                "By chance or nature’s changing course untrimm'd;\n" +
+//                "But thy eternal summer shall not fade,\n" +
+//                "Nor lose possession of that fair thou ow’st;\n" +
+//                "Nor shall death brag thou wander’st in his shade,\n" +
+//                "When in eternal lines to time thou grow’st:\n" +
+//                "   So long as men can breathe or eyes can see,\n" +
+//                "   So long lives this, and this gives life to thee.\n";
+//
+//                public String cryptSonnet (String sonnet ) {
+//            return crypt(sonnet18);
     }
 
 }

SimpleCrypt.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>