Solutions are on master branch.
Only Problem 5 part 2 is on the consensus-breaking branch.
Approached it via 3 different ways - iterative, recursive and by math formula.
Made a todolist practical CRUD blockchain with COSMOS SDK via Ignite CLI. Resource is in the form of item with the fields being desc:String and priority:uint.
More info in the readme.md in /problem\ 5/todolist.
Identified the system components, provided a rough workflow, and lastly some considerations for the different proceesses.