Sorry I'm confusing about how to commit changes, and disturbed some code review process.
I put the complete code and folder for v.0.2.1 on https://github.com/squarednob/crack_it/tree/blender_official.
Diff of all changes:
v0.1.2 to v0.2.2 https://developer.blender.org/D3958
Diffs of each version(it would not correct):
object_fracture_crack addon v0.1.3: Bug fix for input: https://developer.blender.org/D3942
object fracture crack addon v0.2: Detailed input and real-time editing feature: https://developer.blender.org/D3944
And v0.2.1, material preset addition was attached on the same page above https://developer.blender.org/D3944
If I submitted the diffs wrongly, please tell me.