diff --git a/lib/duplicateEncodedr.ts b/lib/duplicateEncodedr.ts
new file mode 100644
index 0000000..37e3557
--- /dev/null
+++ b/lib/duplicateEncodedr.ts
@@ -0,0 +1,44 @@
+export function duplicateEncode(word: string) {
+  let res = "";
+  let i = 0;
+
+  while (i < word.length) {
+    const char = word[i];
+
+    const firstIndex = word.indexOf(char)
+    const lastIndex = word.lastIndexOf(char)
+
+    if (firstIndex !== lastIndex) {
+      res += ")"
+    } else {
+      res += "("
+    }
+
+    i++
+  }
+
+  return res;
+}
+
+export function duplicateEncode1(word: string) {
+  return word
+    .toLowerCase()
+    .split('')
+    .map((a, _, w) => {
+      return w.indexOf(a) == w.lastIndexOf(a) ? '(' : ')'
+    })
+    .join('')
+}
+
+console.log(
+  duplicateEncode("din"), "((("
+)
+console.log(
+  duplicateEncode("recede"), "()()()"
+)
+console.log(
+  duplicateEncode("Success"), ")())())"
+)
+console.log(
+  duplicateEncode("(( @"), "))(("
+)