Make Spreadsheet Private

function makePrivate() {
  var id = SpreadsheetApp.getActiveSpreadsheet().getId()
  DriveApp.getFileById(id).setSharing(DriveApp.Access.PRIVATE , DriveApp.Permission.NONE)

  var editors = DriveApp.getFileById(id).getEditors()

  for (i=0;i < editors.length; i++){
    DriveApp.getFileById(id).removeEditor(editors[i])
  }

}