How to run Update function by using index to Update data in todo app

Question

im run a mini todo app, it uses react, saga. the Add and Delete is running well but Update is not.

this is TodoList.js file to show the content after add,

Todolist.js Todolist.js

and this is reducer.js file to handle logic for buttons :

deducer.js , reducer.js

action and saga just for redux, and i just want create todo and save in local, i dont call any api

action and saga just for redux, and i just want create todo and save in local, i dont call any api .

i just want my todo app run by using react, redux saga, please explain my bug, manny thanks