golang default logger for use in coding challenges

logger.go

import (
    // most already have these imported; putting here just in case
    "log" 
    "os"
)

var (
    // logger = log.New(os.Stdout, "", log.Lshortfile)
    logger1 = log.New(os.Stdout, "optional prefix: ", log.LstdFlags|log.Lshortfile)
    logger2 = log.New(os.Stdout, "log 2: ", log.Lshortfile)
)

func testLog() {
    logger1.Println("inside testLog")
    logger2.Println("also inside testLog")
}

func demoMain() {
    logger2.Println("Hello, world!")
    testLog()
    logger1.Println("Goodbye.")
}

// approx output:
// log 2: some_filename.go:19: Hello, world!
// optional prefix: 2023/07/11 22:04:35 some_filename.go:14: inside testLog
// log 2: some_filename.go:15: also inside testLog
// optional prefix: 2023/07/11 22:04:35 some_filename.go:21: Goodbye.