diff --git a/src/include/parser.h b/src/include/parser.h
index f14c6db..83a1c10 100644
--- a/src/include/parser.h
+++ b/src/include/parser.h
@@ -54,6 +54,7 @@ enum class NodeType {
     Assignment //             -> Identifier = Expr
 };
 
+struct Node;
 struct InnerNode {
     NodeType type;
     vector<Node> children;
@@ -67,6 +68,13 @@ struct Node {
         InnerNode node;
         Token leaf;
     };
+
+    Node() : is_leaf(true), leaf{} {}
+
+    // Explicitly define the destructor
+    ~Node() {
+        if (!is_leaf) node.~InnerNode();
+    }
 };
 
 
diff --git a/src/include/tokenize.h b/src/include/tokenize.h
index e06fd88..f8e1acd 100644
--- a/src/include/tokenize.h
+++ b/src/include/tokenize.h
@@ -2,6 +2,7 @@
 #define TOKENIZE_H
 
 #include <vector>
+#include <string>
 using namespace std;
 
 enum class TokenType { Type, Identifier, Number, Plus, Minus, Star, Slash, Percent, Equal, Semicolon, LParenthese, RParenthese };
@@ -10,7 +11,12 @@ enum class Type { Int };
 union TokenData {
     double number;
     Type type;
-    char* identifier;
+    string identifier;
+
+    TokenData() : number(0.0) {}
+
+    // Explicitly define the destructor
+    ~TokenData() {}
 };
 
 struct Token {
diff --git a/src/main.cpp b/src/main.cpp
index 51068a6..fea2f16 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2,6 +2,7 @@
 using namespace std;
 
 #include "include/input.h"
+#include "include/parser.h"
 
 
 int main(int argc, char* argv[]) {