refactor: remove Cypher

Author: vbetsch

src/main/java/io/github/vbetsch/codecracker/CodeCracker.java

@@ -1,17 +1,21 @@
 package io.github.vbetsch.codecracker;
 
 public class CodeCracker {
-    private final Cypher cypher = new Cypher();
+    private final TranslationDictionary dictionary = new TranslationDictionary();
 
     public char decryptLetter(char letter) {
-        return cypher.decryptLetter(letter);
+        return dictionary.getDecryptions().get(letter);
     }
 
     public char encryptChar(char character) {
-        return cypher.encryptChar(character);
+        return dictionary.getEncryptions().get(character);
     }
 
     public String decryptWord(String string) {
-        return cypher.decryptWord(string);
+        StringBuilder stringBuilder = new StringBuilder();
+        for (char c : string.toCharArray()) {
+            stringBuilder.append(decryptLetter(c));
+        }
+        return stringBuilder.toString();
     }
 }