added rna-transcription exercise

config.json

@@ -28,6 +28,7 @@
     "accumulate",
     "crypto-square"
     "trinary"
+    "rna-transcription"
   ],
   "deprecated": [
   ],

rna-transcription/build.gradle

@@ -0,0 +1,11 @@
+apply plugin: "java"
+apply plugin: "eclipse"
+apply plugin: "idea"
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  testCompile "junit:junit:4.10"
+}

rna-transcription/example.java

@@ -0,0 +1,23 @@
+public class RnaTranscription {
+
+    public static String ofDna(String strand) {
+        StringBuilder sb = new StringBuilder();
+        for (char c : strand.toCharArray()) {
+            switch (c) {
+            case 'A':
+                sb.append('U');
+                break;
+            case 'G':
+                sb.append('C');
+                break;
+            case 'C':
+                sb.append('G');
+                break;
+            case 'T':
+                sb.append('A');
+                break;
+            }
+        }
+        return sb.toString();
+    }
+}

rna-transcription/src/main/java/RnaTranscription.java

@@ -0,0 +1,2 @@
+public class RnaTranscription {
+}

rna-transcription/src/test/java/RnaTranscriptionTest.java

@@ -0,0 +1,36 @@
+import org.junit.Assert;
+import org.junit.Test;
+
+public class RnaTranscriptionTest {
+
+    @Test
+    public void testRnaTranscriptionOfEmptyDnaIsEmptyRna() {
+        Assert.assertEquals("", RnaTranscription.ofDna(""));
+    }
+
+    @Test
+    public void testRnaTranscriptionOfCytosineIsGuanine() {
+        Assert.assertEquals("G", RnaTranscription.ofDna("C"));
+    }
+
+    @Test
+    public void testRnaTranscriptionOfGuanineIsCytosine() {
+        Assert.assertEquals("C", RnaTranscription.ofDna("G"));
+    }
+
+    @Test
+    public void testRnaTranscriptionOfThymineIsAdenine() {
+        Assert.assertEquals("A", RnaTranscription.ofDna("T"));
+    }
+
+    @Test
+    public void testRnaTranscriptionOfAdenineIsUracil() {
+        Assert.assertEquals("U", RnaTranscription.ofDna("A"));
+    }
+
+    @Test
+    public void testRnaTranscription() {
+        Assert.assertEquals("UGCACCAGAAUU",
+                RnaTranscription.ofDna("ACGTGGTCTTAA"));
+    }
+}