folder structure

src/main/java/org/lumijiez/caesar/DoubleCaesar.java

@@ -0,0 +1,21 @@
+package org.lumijiez.caesar;
+
+import org.lumijiez.Utils;
+
+public class DoubleCaesar {
+    public static String encode(int key, String keyWord, String content) {
+        StringBuilder encoded = new StringBuilder();
+
+        String fixedContent = content.replaceAll("\\s","");
+
+        Utils.ALPHABET = Utils.getDoubleCaesarAlphabet(Utils.toCaesarKey(keyWord));
+
+        for (char ch : fixedContent.toCharArray()) {
+            encoded.append(Utils.toNthLetter((Utils.getPos(ch) + key) % Utils.ALPHABET.length()));
+        }
+
+        Utils.returnAlphabet();
+
+        return encoded.toString();
+    }
+}

src/main/java/org/lumijiez/caesar/SimpleCaesar.java

@@ -0,0 +1,35 @@
+package org.lumijiez.caesar;
+
+import org.lumijiez.Utils;
+
+public class SimpleCaesar {
+    public static String encode(int key, String content) {
+        StringBuilder encoded = new StringBuilder();
+
+        String fixedContent = content.replaceAll("\\s","");
+
+        for (char ch : fixedContent.toCharArray()) {
+            encoded.append(Utils.toNthLetter((Utils.getPos(ch) + key) % Utils.ALPHABET.length()));
+        }
+        return encoded.toString();
+    }
+
+    public static String decode(int key, String content) {
+        StringBuilder decoded = new StringBuilder();
+
+        for (char ch : content.toCharArray()) {
+            int currentPosition = Utils.getPos(ch);
+
+            int newPosition = (currentPosition - key) % Utils.ALPHABET.length();
+
+            if (newPosition < 0) {
+                newPosition += Utils.ALPHABET.length();
+            }
+
+            decoded.append(Utils.toNthLetter(newPosition));
+        }
+
+        return decoded.toString();
+    }
+
+}