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import(
b64 "encoding/base64"
"fmt"
)
func main(){
s:="12345"
enc:=b64.StdEncoding.EncodeToString([]byte(s))
fmt.Println(enc)
plain,_:=b64.StdEncoding.DecodeString(enc)
fmt.Println(plain)
fmt.Println(string(plain))
}
output:
MTIzNDU=
[49 50 51 52 53]
12345