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我自己在长安链ide里编译一个求平均值的智能合约时，遇到了/data/gopath230/pkg/mod/golang.org/x/crypto@v0.27.0/curve25519/curve25519.go:13:8: package crypto/ecdh is not in GOROOT (/data/go230copy/src/crypto/ecdh)错误。我的代码具体如下（我的版本为2.3.0）：

package main

import ( "chainmaker/pb/protogo" "chainmaker/sdk" "encoding/json" "errors" "fmt" "log" "strconv" "strings" )

// AverageContract 实现存储和计算平均值的合约 type AverageContract struct { contract.Contract }

// InitContract 初始化合约 func (a *AverageContract) InitContract() error { return nil }

// StoreNumbers 存储一组整数到合约状态 func (a *AverageContract) StoreNumbers(numbers []int) error { // 将整数数组转换为字符串，以逗号分隔 numbersStr := "" for _, num := range numbers { numbersStr += strconv.Itoa(num) + "," } // 存储字符串到合约状态 err := contract.PutState([]byte("numbers"), []byte(numbersStr)) if err != nil { return err } return nil }

// CalculateAverage 读取存储的整数并计算平均值 func (a *AverageContract) CalculateAverage() (int, error) { // 从状态中获取存储的整数 numbersBytes, err := contract.GetState([]byte("numbers")) if err != nil { return 0, errors.New("failed to get numbers from state") } if numbersBytes == nil { return 0, errors.New("no numbers stored") }

numbersStr := string(numbersBytes)
if numbersStr == "" {
	return 0, errors.New("no numbers stored")
}

// 将字符串转换回整数数组
var numbers []int
for _, numStr := range strings.Split(numbersStr, ",") {
	if numStr != "" { // 跳过空字符串
		num, err := strconv.Atoi(numStr)
		if err != nil {
			return 0, err
		}
		numbers = append(numbers, num)
	}
}

if len(numbers) == 0 {
	return 0, errors.New("no valid numbers to calculate average")
}

// 计算平均值
sum := 0
for _, num := range numbers {
	sum += num
}
average := sum / len(numbers)
return average, nil

}

func main() { // 启动合约 err := contract.Serve(new(AverageContract)) if err != nil { panic(err) } } 烦请您帮忙，并且可以的话，可以给我一个求平均值的智能合约的demo吗？