initialize project structure with core modules and configuration

src/dedup.js

@@ -0,0 +1,11 @@
+function normalizeTitle(title) {
+  return String(title || '')
+    .toLowerCase()
+    .replace(/[^a-z0-9\s]/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+}
+
+module.exports = {
+  normalizeTitle,
+};