embed

package main

import (
	embed0 "embed"
	"fmt"
	"io"
	"os"
)

//go:embed testData
var embedBuildBat embed0.FS

func main() {
	outputFilePath := "./output.txt"
	if err := ExtractFile(&embedBuildBat, "testData/hello.txt", outputFilePath); err != nil {
		panic(err)
	}
	if _, err := os.Stat(outputFilePath); os.IsNotExist(err) {
		panic(err)
	}
	defer func() {
		if err := os.Remove(outputFilePath); err != nil {
			panic(err)
		}
	}()
	f, _ := os.Open(outputFilePath)
	defer f.Close()
	dataBytes, _ := io.ReadAll(f)
	fmt.Println(string(dataBytes))

}

Output:

Hello World!