My batch file opens an extra command prompt

I have a batch file that I am making as a little joke for my friend. It's supposed to make a batch file in the startup folder that opens the youtube link to a rick roll. My problem is that whenever I run it, it opens an empty command prompt. It still runs the code you see bellow, and it also opens the youtube link like it should and it closes both normal windows normally.

Here's the code.

@echo off

cd C:Users%useame%AppDataRoamingMicrosoftWindowsStart MenuProgramsStartup

echo @echo off > startup.bat

echo start (link) >> startup.bat

start startup.bat

Could someone help point out where I went wrong?

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