gistfile1.go

package main

import (
    "encoding/base32"
    "encoding/binary"
    "fmt"
)

func HashChatId(v uint64) string {
    var b [8]byte
    binary.LittleEndian.PutUint64(b[:], v)
    s := base32.StdEncoding.WithPadding(base32.NoPadding).EncodeToString(b[:])
    // cap at 20 chars
    if len(s) > 20 {
        return s[:20]
    }
    return s
}