columnize.go
func MergeConfig(a, b *Config) *Config {
	// Return quickly if either side was nil
	if a == nil {
		return b
	}
	if b == nil {
		return a
	}

	var result Config = *a

	if b.Delim != "" {
		result.Delim = b.Delim
	}
	if b.Glue != "" {
		result.Glue = b.Glue
	}
	if b.Prefix != "" {
		result.Prefix = b.Prefix
	}
	if b.Empty != "" {
		result.Empty = b.Empty
	}
	if b.NoTrim {
		result.NoTrim = true
	}

	return &result
}
func MergeConfig(a, b *Config) *Config {
	// Return quickly if either side was nil
	if a == nil {
		return b
	}
	if b == nil {
		return a
	}

	var result Config = *a

	if b.Delim != "" {
		result.Delim = b.Delim
	}
	if b.Glue != "" {
		result.Glue = b.Glue
	}
	if b.Prefix != "" {
		result.Prefix = b.Prefix
	}
	if b.Empty != "" {
		result.Empty = b.Empty
	}
	if b.NoTrim {
		result.NoTrim = true
	}

	return &result
}
// MergeConfig merges two config objects together and returns the resulting
// configuration. Values from the right take precedence over the left side.