func (f Flash) Set(key string, values []string) {
	f.data[key] = values
}
func (f Flash) Set(key string, values []string) {
	f.data[key] = values
}
func ( f Flash ) Set ( key string , values [ ] string ) { f . data [ key ] = values }
//Set allows to set a list of values into a particular key.
Set allows to set a list of values into a particular key .