Refactor and simplify package structure and interfaces.

Reorganize code by removing unused files, restructuring package organization, and updating import references to new paths. This simplifies handling of smart and protocol-related operations, improves maintainability, and eliminates redundancy.

pkg/utils/crypto.go

@@ -0,0 +1,15 @@
+package utils
+
+import (
+	"crypto/hmac"
+	"crypto/md5"
+	"encoding/hex"
+)
+
+func GenerateVerifyKey(key string) string {
+	mac := hmac.New(md5.New, []byte(key))
+
+	mac.Write([]byte(key))
+
+	return hex.EncodeToString(mac.Sum(nil))
+}