package main

import (
	"fmt"
	"log"
)

func init() {
	log.Println("plugin init function called")
}

func SumInt(args ...interface{}) (interface{}, error) {
	var sum int
	for _, arg := range args {
		v, ok := arg.(int)
		if !ok {
			return nil, fmt.Errorf("unexpected type: %T", arg)
		}
		sum += v
	}
	return sum, nil
}

func ConcatenateString(args ...interface{}) (interface{}, error) {
	var result string
	for _, arg := range args {
		v, ok := arg.(string)
		if !ok {
			return nil, fmt.Errorf("unexpected type: %T", arg)
		}
		result += v
	}
	return result, nil
}