McFunction extension versioning

We get confused when the way Minecraft commands are written changes drastically, so why not provide a McFunction file extension for each version?

Method I thought 1
1. 1. Make one version of McCommand compatible with later versions of McCommand.
1. 2. McFunction extension is prepared for each version.
1. 3. Execute by specifying the version of McFunction.

Method 2 I thought of
2. 1. Separate McFunction and Minecraft.
2. 2. Minecraft works according to McFunction.
2. 3. McFunction works on other versions as well.

Method 3 I thought
3. 1. Makes McFunction executable in program languages.
3. 2. Ask the Minecraft player to create other versions of the format.

Why I want this.
4.1 It will be confusing if the writing style changes as in 1.13.
4.2 Of the several methods I have come up with, (3) and others seem to be fun because you can use Minecraft more freely.

The sentences so far may have had some unusual parts.
Because my mother tongue is not English. Excuse me.