import ( "github.com/tsuru/tsuru/auth" "fmt" ) token := "myAuthToken" username, err := auth.GetTokenManager().GetUserName(token) if err != nil { fmt.Printf("Error: %v\n", err) } fmt.Printf("User name: %s\n", username)In this example, the GetUserName() function is used to retrieve the username associated with the "myAuthToken" token. If successful, the function will return the associated username and the output will be "User name: [username]". Overall, the github.com.tsuru.tsuru.auth package is useful for managing authentication and authorization in Tsuru applications. The Token.GetUserName() function is just one example of the helpful utilities available in this package.