Fix: Add adware url decoding support (#33)

* chg: fix: add bludv url decoding support

* chg: feat: add safeguards against future algorithim changes

utils/decoder.go

@@ -0,0 +1,28 @@
+package utils
+
+import (
+	"encoding/base64"
+	"html"
+)
+
+func DecodeAdLink(encodedStr string) (string, error) {
+	reversed := reverseString(encodedStr)
+
+	decodedBytes, err := base64.StdEncoding.DecodeString(reversed)
+	if err != nil {
+		return "", err
+	}
+
+	htmlUnescaped := html.UnescapeString(string(decodedBytes))
+
+	return htmlUnescaped, nil
+}
+
+// Helper function to reverse a string
+func reverseString(s string) string {
+	runes := []rune(s)
+	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
+		runes[i], runes[j] = runes[j], runes[i]
+	}
+	return string(runes)
+}