#include <Windows.h>

#include <memory>
#include <string>

int main()
{
    auto titleToFind = L"Developer tools";

    EnumWindows([](HWND hwnd, LPARAM lParam) {
        auto titleToFind = reinterpret_cast<LPTSTR>(lParam);

        int size = GetWindowTextLength(hwnd) + 1;
        auto buffer = std::make_unique<wchar_t []>(size);
        GetWindowText(hwnd, buffer.get(), size);

        auto title = std::wstring{ buffer.get() };

        if (IsWindowVisible(hwnd) && title.find(titleToFind) != std::wstring::npos) {
            SendMessage(hwnd, WM_SYSCOMMAND, SC_CLOSE, 0);
        }

        return TRUE;
    }, reinterpret_cast<LPARAM>(titleToFind));
}