You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: werun.go
    path of file: ./repos/wechat/miniprogram/werun
    
    the code of the file until where you have to start completion: package werun

import (
	"encoding/json"

	"github.com/silenceper/wechat/v2/miniprogram/context"
	"github.com/silenceper/wechat/v2/miniprogram/encryptor"
)

// WeRun 微信运动
type WeRu
    
func (werun *WeRun) GetWeRunData(sessionKey, encryptedData, iv string) (*Data, error) {
	cipherText, err := encryptor.GetCipherText(sessionKey, encryptedData, iv)
	if err != nil {
		return nil, err
	}
	var weRunData Data
	err = json.Unmarshal(cipherText, &weRunData)
	if err != nil {
		return nil, err
	}
	return &weRunData, nil
}