function copyDocs() {
    var file = DriveApp.getFilesByName('Master file of Gradebook');
    file.makeCopy();
    var Id = file.makeCopy().getId();
}
function renameDoc() {
  var doc = DocumentApp.getActiveDocument();
  var name = doc.getName();
  doc.setName('Done-' + "Nursary KC" + "Manjit Rani");
}