|____go.mod
|____util
| |____utils.go
|____calc.go
|____main.go


// go.mod
module demo

go 1.19

// calc.go
package main

func add(num1 int, num2 int) int {
	return num1 + num2
}

// utils.go

package util

func min(a int, b int) int {
	if a <= b {
		return a
	}
	return b
}

func Min(a int, b int) int {
	if a <= b {
		return a
	}
	return b
}

// main.go

package main

import (
	"demo/util"
	// package util is not in GOROOT (/usr/local/go/src/util)
	// "util"
	"fmt"
)

func main() {
	fmt.Println("hello")
	fmt.Println(add(1, 2))

	fmt.Println(util.Min(2, 3))
	// undefined: util.min
	// fmt.Println(util.min(2, 3))

}




https://gitee.com/dyyx/hellocode/tree/master/demo/go/gomod