func SaveConfigFile(c *ConfigFile, filename string) (err error) {
	var f *os.File
	if f, err = os.Create(filename); err != nil {
		return err
	}
	if err := SaveConfigData(c, f); err != nil {
		return err
	}
	return f.Close()
}
SaveConfigFile writes configuration file to local file system
package goconfig
import (
	"bytes"
	"io"
	"os"
	"strings"
)
var PrettyFormat = true
func SaveConfigData(c *ConfigFile, out io.Writer) (err error) {
	equalSign := "="
	if PrettyFormat {
		equalSign = " = "
	}
	buf := bytes.NewBuffer(nil)
	for _, section := range c.sectionList {
		if len(c.GetSectionComments(section)) > 0 {
			if _, err = buf.WriteString(c.GetSectionComments(section) + LineBreak); err != nil {
				return err
			}
		}
		if section != DEFAULT_SECTION {
			if _, err = buf.WriteString("[" + section + "]" + LineBreak); err != nil {
				return err
			}
		}
		for _, key := range c.keyList[section] {
			if key != " " {
				if len(c.GetKeyComments(section, key)) > 0 {
					if _, err = buf.WriteString(c.GetKeyComments(section, key) + LineBreak); err != nil {
						return err
					}
				}
				keyName := key
				if keyName[0] == '#' {
					keyName = "-"
				}
				if strings.Contains(keyName, `=`) || strings.Contains(keyName, `:`) {
					if strings.Contains(keyName, "`") {
						if strings.Contains(keyName, `"`) {
							keyName = `"""` + keyName + `"""`
						} else {
							keyName = `"` + keyName + `"`
						}
					} else {
						keyName = "`" + keyName + "`"
					}
				}
				value := c.data[section][key]
				// In case key value contains "`" or "\"".
				if strings.Contains(value, "`") {
					if strings.Contains(value, `"`) {
						value = `"""` + value + `"""`
					} else {
						value = `"` + value + `"`
					}
				}
				if _, err = buf.WriteString(keyName + equalSign + value + LineBreak); err != nil {
					return err
				}
			}
		}
		if _, err = buf.WriteString(LineBreak); err != nil {
			return err
		}
	}
	if _, err := buf.WriteTo(out); err != nil {
		return err
	}
	return nil
}