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So again, we could very easily keep everything in mind because this will be a small program.

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But let's take a quick minute to implement good practice and place our code in another file and then

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we will just have main.

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All that code.

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So let's create a new file inside of source called Find and Replace.

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And in here is where we can store all of our logic.

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So let's take all of this.

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Cut it out here, paste it in here, and then let's take this function, cut it out of here, and also

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put it in here.

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And then we're going to create a public function called run, which is where we can take all of our

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logic inside of main take it out and.

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Place it inside of here.

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So now we can come into main address and say mod find and replace.

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And now we can just say find and replace.

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Run.

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And it's able to find it because run is public.

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So all of that is good.

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But now let's just make sure before we try running this, let's look at our our tree.

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So remember, we can use cargo modules, generate tree, and then I want to generate mine with types

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that I can see everything.

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So we see we have our find and replace module.

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We have our stuck in here private.

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Great our print help function is private perfect.

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And now our run function is public, which we then call inside of main.

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So everything looks good.

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So now let's run it.

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Make sure our error message is is printed out.

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And they are.

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So now let's run it again with giving it four arguments.

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And perfect.

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So we're back at the same place we were prior to separating our code into a module.

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So now we're right back to where we were and now we can continue on with handling our file logic.