lastword2.js

  const findLastWord = (editor) => {
      console.log(editor.selection);
      Transforms.move(editor, { distance: 1, unit: 'word', reverse: true, edge: 'start' })
      console.log(editor.selection);
      const selected = Editor.string(editor, editor.selection);
      console.log(selected);
      Transforms.move(editor, {distance: 2, unit: 'word', edge: 'start'});
      editor.insertText(' ');
  };