refactor: rename decrypt to decryptLetter

Author: vbetsch

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

@@ -8,14 +8,14 @@ public class CodeCracker {
             'b', ')'
     );
 
-    public char decrypt(char letter) {
+    public char decryptLetter(char letter) {
         return this.translations.get(letter);
     }
 
     public String decryptWord(String string) {
         StringBuilder stringBuilder = new StringBuilder();
         for (char c : string.toCharArray()) {
-            stringBuilder.append(decrypt(c));
+            stringBuilder.append(decryptLetter(c));
         }
         return stringBuilder.toString();
     }

src/test/java/io/github/vbetsch/codecracker/CodeCrackerTest.java

@@ -11,7 +11,7 @@ void should_returnExclamationPoint_whenDecryptLetterA() {
         CodeCracker codeCracker = new CodeCracker();
 
         // Act
-        char decryptedLetterA = codeCracker.decrypt('a');
+        char decryptedLetterA = codeCracker.decryptLetter('a');
 
         // Assert
         assertEquals('!', decryptedLetterA);
@@ -23,7 +23,7 @@ void should_returnEndParenthesis_whenDecryptLetterB() {
         CodeCracker codeCracker = new CodeCracker();
 
         // Act
-        char decryptedLetterA = codeCracker.decrypt('b');
+        char decryptedLetterA = codeCracker.decryptLetter('b');
 
         // Assert
         assertEquals(')', decryptedLetterA);