Aggiunti alcuni esercizi di java.

squeaky-clean/src/main/java/SqueakyClean.java

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+import java.util.Locale;
+import java.util.regex.Pattern;
+
+class SqueakyClean {
+    static String clean(String identifier) {
+
+        var result = identifier.replace(' ', '_')
+                .replaceAll("[α-ω]", "")
+                .replaceAll("\\p{C}", "CTRL")
+                .replaceAll("[^\\p{L}\\p{P}]", "");
+        var matcher = Pattern.compile("(.*)(-\\p{L})(.*)").matcher(result);
+        if (matcher.matches()) {
+            result = matcher.replaceAll(
+                    matcher.group(1)
+                            + matcher.group(2).toUpperCase(Locale.ROOT).substring(1)
+                            + matcher.group(3)
+            );
+        }
+        return result;
+    }
+}