关于go：Golang：遍历结构的字段是否对其进行修改并返回该结构？

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type Post struct{
    fieldName           data     `check:"value1"
    ...
}

type Post struct{
    fieldName           data     `check:"value2"
    ...
}

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type Datastore interface {
     ...
}

 func CheckSwitch(value reflect.Value){
    //this loops through the fields
    for i := 0; i < value.NumField(); i++ { // iterates through every struct type field
        tag := value.Type().Field(i).Tag // returns the tag string
        field := value.Field(i) // returns the content of the struct type field

        switch tag.Get("check"){
            case"value1":
                  fmt.Println(field.String())//or some other function
            case"value2":
                  fmt.Println(field.String())//or some other function
            ....

        }
        ///how could I modify the struct data during the switch seen above and then return the struct with the updated values?


}
}

//the check function is used i.e
function foo(){
p:=Post{fieldName:"bar"}
check(p)
}

func check(d Datastore){
     value := reflect.ValueOf(d) ///this gets the fields contained inside the struct
     CheckSwitch(value)

     ...
}

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 field.SetString("hello")

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function foo(){
    p:=Post{fieldName:"bar"}
    check(&p)
}

func check(d Datastore){
   value := reflect.ValueOf(d)
   if value.Kind() != reflect.Ptr {
      // error
   }
   CheckSwitch(value.Elem())
   ...
}