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: formatter_bytes.go
    path of file: ./repos/plumber/vendor/github.com/v2pro/plz/msgfmt
    
    the code of the file until where you have to start completion: package msgfmt

import "unicode/utf8"

type bytesFormatter int

func (formatter bytesFormatter) Format(space []byte, properties []interface{}) []byte {
	return writeBytes(space, properties[formatter].([]byte))
}

// safeSet ho
    
func writeBytes(space []byte, s []byte) []byte {
	// write string, the fast path, without utf8 and escape support
	var i int
	var c byte
	for i, c = range s {
		if c < utf8.RuneSelf && safeSet[c] {
			space = append(space, c)
		} else {
			break
		}
	}
	if i == len(s)-1 {
		return space
	}
	return writeBytesSlowPath(space, s[i:])
}