Euler
The idea is to solve a problem from Project Euler at day.
Since a problem can have many solutions, the idea is to create a folder for every problem using the index of the problem as a folder name (eg 1 for the first problem and 15 for the fifthteen problem) and use lowercase letters for every possible solution.
Every problem folder should have a problem.md file with the instructions for the problem.
For example:
euler/
├── 1/
│ ├── a.py
│ ├── b.py
│ └── problem.md
└── 2/
├── a.py
├── b.py
├── c.py
└── problem.md