ini.go
func (c *Config) Sections() []string {
	var sections []string
	for _, sect := range c.sections {
		sections = append(sections, sect.name)
	}
	return sections
}
func (c *Config) Sections() []string {
	var sections []string
	for _, sect := range c.sections {
		sections = append(sections, sect.name)
	}
	return sections
}
// Sections returns the list of sections in the file.