using System.Diagnostics;

string[] files;

files = Directory.GetFiles("assets");
if(Directory.Exists("qr"))
    Directory.Delete("qr", true);
    Directory.CreateDirectory("qr");

foreach (var item in files)
{
    string name = Path.GetFileName(item);

    //https://gitea.kqnori.pl/kq/qrcode/raw/branch/main/assets/gay.png
    Process.Start("qrencode",$"https://gitea.kqnori.pl/kq/qrcode/raw/branch/main/assets/{item} -o qr/item{name.Split('.').First()}.png");
}