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: convert_string_to_consonantcase.go
    path of file: ./repos/program/program/convert-string-to-consonantcase
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"
	"strings"
)

func consonantCase(str string) string {
	var result string
	for _, char := range str {
		if strings.ContainsAny(string(char), "aeiouAEIOU") {
			result 
    
func consonantCase(str string) string {
	var result string
	for _, char := range str {
		if strings.ContainsAny(string(char), "aeiouAEIOU") {
			result += strings.ToLower(string(char))
		} else {
			result += strings.ToUpper(string(char))
		}
	}
	return result
}