How to insert a string inside another string using Go lang

You could turn the first string into a template for Sprintf. It would look like this:

p := "</table>%s</body></html>"
out := fmt.Sprintf(p,"<pagebreak />")

Working code here: https://play.golang.org/p/AInfyQwpy2

You can simply use slice operations on the string:

package main

func main() {
    p := "green"
    index := 2
    q := p[:index] + "HI" + p[index:]
    fmt.Println(p, q)
}

Working example: https://play.golang.org/p/01phuBKuBB

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