I have these router declared in express.js, I wonder why the `run user` got triggered when I open localhost:3000/myname/profile. 

```
router.get('/:username', function(req, res, next)
{
    console.log('run user')
});

router.get('/:username/profile', function(req, res, next)
{
    console.log('run user profile')
});

```

I expect it won't,how to solve that?
please anyone help me?
Thank you in advance....