I wish converting from one type to another to be much easier in golang 🙂 anyway if you want to convert an int64 into a string you can use the FormatInt function from the strconv package:
func FormatInt(i int64, base int) string
Conversion example:
package main
import (
"fmt"
"strconv"
)
func main() {
myInt64 := int64(354)
s := strconv.FormatInt(myInt64, 10)
fmt.Println(s)
}