// do template string substitution. All template variables have to start with `prefix_byte`
func SearchAndJoin(template string, prefix_byte byte, template_params []string, template_values []string) string {
    ss := make([]string, 0, 16)
    remaining := template
    for {
        index := strings.IndexByte(remaining, prefix_byte)
        if index == -1 {
            ss = append(ss, remaining)
            break
        }
        ss = append(ss, remaining[:index])
        remaining = remaining[index:]

        substituted := false
        for i, placeholder := range(template_params) {
            if strings.HasPrefix(remaining, placeholder) {
                replacement := (template_values[i])
                ss = append(ss, replacement)
                remaining = remaining[len(placeholder):]
                substituted = true
                break
            }
        }

        if !substituted {
            ss = append(ss, remaining[:1])
            remaining = remaining[1:]
        }
    }

    return strings.Join(ss, "")
}