better feedback if input is not uuid format.

if is_uuid $unwrap_token ; then

  curl -k -s --header "X-Vault-Token: $unwrap_token" --request POST https://vault.stanford.edu/v1/sys/wrapping/unwrap  | jq -r '.data'

else

  echo $unwrap_token should be an uuid string.

  echo $unwrap_token is not a uuid string.

fi