So just to give you some help with doing 
the editor project, this video is just a 
quick demo of what the editor should do 
when its done. 
So here I'm in a solutions file, which 
you'll get after the project is over. 
Remember, this is our solution. 
Your solution will have a similar 
structure, maybe not the exact same 
structure, and should definitely have 
this functionality. 
Let me run it. 
And then I'll start it with main of make 
Editor, but we'll just start it with an 
empty string, and of course, in an empty 
string, it has to be at position 0. 
And it pops up a little editor here. 
Let me move it so you can see it a bit 
better. 
And I can just type in this editor, hello 
there. 
And if I press the back arrow key I move 
to the left, if I press the right arrow 
key I move to the right, and wherever I 
am the characters get inserted. 
It's just like the simple editor you'd 
have on your phone maybe to send text 
messages. 
And just to be clear about, what happens 
with the argument to main, let me restart 
it now. 
I'll say main, make editor, dog, cat, 
starting at position, 3. 
And this editor starts out with the 
string, dog cat. 
And the cursor starts out at position 3. 
Remember, we're using 0-based indexing, 
so to the left of the D is 0, 1, 2, 3. 
And then we can edit from there. 
And of course, dog, cat, I don't know, 
mouse. 
Do those go together? 
Who knows. 
When we close this, the final result the 
big bag produces is the final world's 
day. 
So that's a quick little demo of what the 
editor is supposed to do. 
We hope that this will answers most of 
your questions about what we're asking 
you to design.