code: func (c *DbClient) GetDataForKey(key string) (*decoder.FileDataEntry, bool) {
  	c.Lock()
  	defer c.Unlock()
  
  	for _, file := range c.db {
  		value, ok := file[key]
  		if ok {
  			return &decoder.FileDataEntry{
  				Key:   key,
  				Value: value.data,
  			}, true
  		}
  	}
  	return nil, false
  }
docs: // GetDataForKey returns data for given key.