Problems with static and non-static methods and driver... (NullPointerException)

I try to make me testing code more readable, but I have some problems with the availability of my driver. I will show you the code:

Here I implement my firefox webdriver:

package journey.setup;

import org.junit.Before;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class driver
{
    public WebDriver driver;

    @Before
    public void driver()
    {
        System.setProperty("webdriver.gecko.driver",
                "C:\\...\\geckodriver-v0.23.0-win64\\geckodriver.exe");
        driver = new FirefoxDriver();
    }

}

Next I wrote a class that make a class to get the url and is more readable:

package journey.actions;

import journey.setup.driver;

public class go extends driver
{
    public static void to (String url)
    {
        driver driver = new driver();
        driver.driver.get(url);
    }
}

After that I have the readable method "go.to" in my test. But it doesn't work :(

public class login
{
    @Given("^You visit: \"([^\"]*)\"$")
    public void youVisit(String url) throws Throwable
    {
        go.to(url);
    }
}

Have you an idea?