You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fieldnames.go
    path of file: ./repos/cosmos-sdk/orm/internal/fieldnames
    
    the code of the file until where you have to start completion: package fieldnames

import (
	"strings"

	"google.golang.o
    
func CommaSeparatedFieldNames(fields string) FieldNames {
	// normalize cases where there are spaces
	if strings.IndexByte(fields, ' ') >= 0 {
		parts := strings.Split(fields, ",")
		for i, part := range parts {
			parts[i] = strings.TrimSpace(part)
		}
		fields = strings.Join(parts, ",")
	}
	return FieldNames{fields: fields}
}