func (c *Configer) DefaultString(key string, defaultval string) string {
	v := c.String(key)
	if v == "" {
		return defaultval
	}
	return v
}
// DefaultString returns the string value for a given key.
// if err != nil return defaltval
DefaultString returns the string value for a given key.
if err != nil return defaltval
// DefaultString returns the string value for a given key . // if err ! = nil return defaltval
func (c *Configer) DefaultString(key string, defaultval string) string {
	v := c.String(key)
	if v == "" {
		return defaultval
	}
	return v
}
func ( c * Configer ) DefaultString ( key string , defaultval string ) string { v := c . String ( key ) if v == " " { return defaultval } return v }
DefaultString returns the string value for a given key.
DefaultString returns the string value for a given key .