Построить башню

Describe(Tests)
{
    It(ExampleTest1)
    {
        std::vector<std::string> expected = { "*" };
        std::vector<std::string> actual = towerBuilder(1);
    
        Assert::That(actual, Is().EqualTo(expected));
    }
    
    It(ExampleTest2)
    {
        std::vector<std::string> expected = { " * ", "***" };
        
        std::vector<std::string> actual = towerBuilder(2);
    
        Assert::That(actual, Is().EqualTo(expected));
    }
    
    It(ExampleTest3)
    {
        std::vector<std::string> expected = { "  *  ", " *** ", "*****" };
        std::vector<std::string> actual = towerBuilder(3);
    
        Assert::That(actual, Is().EqualTo(expected));
    }
};

#include <iostream>
 
using std::cout;
using std::cin;
 
int main() {
    int layer;
 
    cout << "Enter layer: ";
    cin >> layer;
 
    for (int countLayer = 1; countLayer <= layer; countLayer++) {
        for (int countElement = 0; countElement < countLayer * 2 - 1; countElement++) {
            cout << "*";
        }
        cout << "\n";
    }
    
    return 0;
}

#include <iostream>
 
void build_tower(int stages)
{
    for (int i = 1; i <= stages; ++i)
    {
        for (int j = 1; j <= i; ++j)
            std::cout << '*';
        std::cout << '\n';
    }
}
 
int main()
{
    build_tower(4);
}

[
  '  *  ', 
  ' *** ', 
  '*****'
]