Question $3$: Create a program that a user can use to manage notes for the experiment. $(25$ pts$.)$

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CORSmRE st$\%$NU

$11$at $-$ DLaplay all notes

view $-$ View a note

add $-$ Add a note

de$1-$ Delete a note

exit $-$ Exit program

Command: $1$iat

There are no notes in the list.

Conimand: add

Enter your note here;Day $11$: The experiment failed again. Sigh.

You added one note up$.$

Command: add

Enter your note here:Day $12$: The experiment failed again. $5$igh.

You added one note up$.$

Command: del

Note to delete: B

Invalld note number.

Command: $1$iet

$1.$ Day $11$: The experiment Eailed again. Sigh.

$2.$ Day $12$: The experiment Eailled again. Sigh.

Command: Viow

number: $1$

Day $11$: The experiment failed again$-5$igh.

Command: del

Note to delete: $1$

This note is deleted.

Command: $1$:et

$1.$ Day $12$: The experiment failed again. Sigh.

Command: exit

Bye!

$(3$a$)$ Follow the logical structure shown in the screenshot. You should create a text file named notes.txt to store all current notes of the experiment. $(10$ pts$.)$

$(3$b$)$ For the list and view commands, if the file notes.txt is blank, display: There are no notes in the list. $(2$ pts$.)$

$(3$c$)$ For the view and del commands, display an error message if the user enters an invalid note number. $(4$ pts$.)$

$(3$d$)$ When you add or delete a note, the change should be saved to the file notes.txt immediately. That way, no changes are lost, even if the program crashes later. $(4$ pts$)$

$(3$e$)$ When appropriate, use f$-$string to format output messages. $(3$ pts$.)(3$f$)$ Be mindful of small details. For example, keep all input commands in lowercase $($or at least be consistent$),$ deal with invalid values, add newline characters, format, etc. $(2$ pts$.)$

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