function returnText(message) {

switch(message.indexOf(mykey)!== -1) {
case true:
  var mykey = 'ziptest'
  break;
case true:
  var mykey = 'setnum'
  break;
default:
    Logger.log('default');

function returnText1() {
  returnText('ziptest 19886991201')
}

var mykey = 'ziptest'