Перемещение окна вслед за мышью, не за заголовок

#include<Windows.h>
LRESULT CALLBACK WinProc(HWND, UINT, WPARAM, LPARAM);
HWND hWnd;
char WinClass[] = "Window";
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpArg, int nStyle)
{
    WNDCLASSEX wncl;
    MSG message;
    wncl.hInstance = hInstance;
    wncl.lpszClassName = WinClass;
    wncl.lpfnWndProc = WinProc;
    wncl.style = CS_DBLCLKS | CS_DROPSHADOW;
    wncl.cbSize = sizeof(WNDCLASSEX);
    wncl.hIcon = LoadIcon(0, IDI_WINLOGO);
    wncl.hIconSm = LoadIcon(0, IDI_WINLOGO);
    wncl.hCursor = LoadCursor(NULL, IDC_ARROW);
    wncl.lpszMenuName = NULL;
    wncl.cbClsExtra = 0;
    wncl.cbWndExtra = 0;
    wncl.hbrBackground = CreateSolidBrush RGB(50, 50, 70);
    if (!RegisterClassEx(&wncl))
        return 0;
    hWnd = CreateWindowEx(NULL, WinClass, "Control", WS_OVERLAPPED | WS_SYSMENU, 0, 0, 500, 400, NULL, NULL, NULL, NULL);
    ShowWindow(hWnd, SW_SHOW);
    while (GetMessage(&message, hWnd, 0, 0))
    {
        TranslateMessage(&message);
        DispatchMessage(&message);
    }
    return message.wParam;
}
LRESULT CALLBACK WinProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    POINT lp;
    RECT rc;
    switch (message)
    {
    case WM_CLOSE:
    {
        PostQuitMessage(0);
        return 0;
    }
    case WM_MOUSEMOVE:
    {
        GetCursorPos(&lp);
    }
    case WM_LBUTTONDOWN:
    {
        GetWindowRect(hWnd, &rc);
        MoveWindow(hWnd, lp.x - rc.left, lp.y - rc.bottom, 500, 400, TRUE);
    }
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
        break;
    }
    return 0;
}

        case WM_LBUTTONDOWN:
        {
            ReleaseCapture();
            SendMessage(hWnd, WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0);
        }break;

case WM_LBUTTONDOWN:
{
            SendMessage(hWnd, WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0);
}break;

case WM_LBUTTONDOWN:
{
    SendMessage(hWnd, WM_NCLBUTTONDOWN, HTCAPTION, 0);
}break;