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: cache.go
    path of file: ./repos/Artalk/internal/cache/simple_cache
    
    the code of the file until where you have to start completion: package simple_cache

import (
	"sync"
	"sync/atomic"
	"time"
)

type Cache struct {
	data sync.Map
	// when the number of entries reaches gcThold, GC will be triggered
	gcThold int
	len	 atomic.Int
    
func (c *Cache) Get(key string) (interface{}, bool) {
	defer c.GC(false)
	if val, found := c.data.Load(key); found {
		entry := val.(cacheEntry)
		if !isExpired(entry) {
			return entry.value, true
		}
		c.data.Delete(key)
	}
	return nil, false
}