Увеличить вдвое элементы стека

#include <iostream>
#include <cstdlib>
#include <ctime>
 
struct Node {
    int value;
    Node* next;
};
 
//-----------------------------------------------------------------------------
void push(Node*& stack, int value) {
    Node* node = new Node;
    node->value = value;
    node->next = stack;
    stack = node;
}
//-----------------------------------------------------------------------------
Node* make(unsigned count, int min, int max) {
    srand(time(nullptr));
 
    Node* stack = nullptr;
    while (count--) {
        push(stack, rand() % (max - min) + min);
    }
    return stack;
}
//-----------------------------------------------------------------------------
void ratio(Node* stack, int number) {
    for (; stack; stack = stack->next) {
        stack->value *= number;
    }
}
//-----------------------------------------------------------------------------
void print(const Node* stack) {
    for (; stack; stack = stack->next) {
        std::cout << stack->value << ", ";
    }
    std::cout << "\b\b " << std::endl;
}
//-----------------------------------------------------------------------------
 
int main() {
    Node* stack = make(10, 0, 30);
 
    print(stack);
 
    ratio(stack, 2);
 
    print(stack);
 
    return 0;
}