var MainConfig NonPtrObj.

MainConfigDefaultsSetProcessed -> it's only for securing the processing function! When multiple goroutines access GetConfig And it's not yet processed!.

MainConfigDefaultsSetProcessing -> it shows if the default settings have being set to MainConfig It will be used in GetConfig function where we get the config...

MainConfigJson -> here we store same MainConfig but in json format, why? for faster reading nested keys or for reading dynamically by using string paths.

MainConfigViper -> we store the instance of viper for the main config file!.