Command Prompt window appears with gui window c++ - c++

Question

Whenever I try to make a c++ gui program/window the command prompt window appears with the window like this:
but all I did was this::
#include <iostream>
#include "define.h"
LRESULT CALLBACK WinProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmdLine, int nShowCmd){
window win;
MSG msg;
win.cbClsExtra = NULL; //Additional parameters
win.cbWndExtra = NULL; //Additional parameters
win.hbrBackground = (HBRUSH)COLOR_WINDOW ; //Sets background color for the window
win.hCursor = LoadCursor(NULL, IDC_ARROW); //The cursor that will appear in the window
win.hIcon = NULL; //Icon for the window
win.hInstance = hInst; //Handle to the application instance
win.lpszClassName = "Window Class"; //The unique name of the window class
win.lpszMenuName = NULL; //Used for menus
win.style = NULL; //The look and feel of the window
win.lpfnWndProc=(WNDPROC)WinProc; //The callback procedure (more on that later)
RegisterClass(&win);
HWND hwnd = CreateWindow("Window Class", "Title", WS_OVERLAPPEDWINDOW, 200, 200, 640, 480, NULL, NULL, hInst, NULL);
ShowWindow(hwnd, SW_SHOWNORMAL);
while(GetMessage(&msg, NULL, 0, 0)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WinProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam){
switch (message){
case WM_CREATE:{
HWND button = CreateWindow("BUTTON", "ok", WS_VISIBLE | WS_CHILD | WS_BORDER, 20, 20, 50, 30, hWnd, NULL, NULL, &lParam);
break;
}
case WM_DESTROY:{
PostQuitMessage(0);
return 0;
break;
}
default:{
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
}
I followed the code just on internet and don't think I did something wrong I want to remove this annoying cmd window by any way...
tysm for all repliers much appreciated...........
EDIT
and btw the define.h is a header file I made and define WNDCLASS as window