package main

import (
    "encoding/xml"
    "fmt"
    "strings"
    "text/template"
)

type crm struct {
    Char, Rem string
}

var tmpl = `<CharacterRemarks>
{{range .}}    <Character name="{{xml .Char}}">{{xml .Rem}}</Character>
{{end}}</CharacterRemarks>
`

func xmlEscapeString(s string) string {
    var b strings.Builder
    xml.Escape(&b, []byte(s))
    return b.String()
}

func main() {
    xt := template.New("").Funcs(template.FuncMap{"xml": xmlEscapeString})
    template.Must(xt.Parse(tmpl))

    // Define function required by task description.
    xRemarks := func(crms []crm) (string, error) {
        var b strings.Builder
        err := xt.Execute(&b, crms)
        return b.String(), err
    }

    // Call the function with example data.  The data is represented as
    // a "single mapping" as allowed by the task, rather than two lists.
    x, err := xRemarks([]crm{
        {`April`, `Bubbly: I'm > Tam and <= Emily`},
        {`Tam O'Shanter`, `Burns: "When chapman billies leave the street ..."`},
        {`Emily`, `Short & shrift`}})
    if err != nil {
        x = err.Error()
    }
    fmt.Println(x)
}