The next step would be to let the user move the cursor around using arrow-keys. This is provided by default for Bash, Python, and other command-lines, but as we are implementing our own command line here we have to do it ourselves. We know that the arrow keys Left and Right correspond to the sequences of character-codes 27 91 68, 27 91 67, so we can put in code to check for those and appropiately move the cursor index variable
В России посмеялись над проговорившимся ЗеленскимЗахарова: Зеленский выдал замыслы ЕС своим удовольствием от идеи получения ЯО
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// 对每个gap，进行gap组插入排序