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Add solution for "Day 4: Printing Department", part 1

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Stefan Müller
2025-12-04 23:46:44 +01:00
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@@ -8,6 +8,12 @@ This is a single command line application for the puzzles written in [Rust](http
This project does not contain the puzzle or example inputs as per the [copyright notice of Advent of Code](https://adventofcode.com/about). In order to run the compiled application, the puzzle inputs have to be downloaded from the [Advent of Code 2025](https://adventofcode.com/2025/) puzzle pages, and placed as text files into the `AdventOfCode2025\data` directory, e.g. `AdventOfCode2025\data\secret_entrance.txt`, or `AdventOfCode2025\data\example\secret_entrance.txt` for the unit tests. The application will output an error message with details if it cannot find an input file.
## Solutions
### Day 4: Printing Department
:mag_right: Puzzle: <https://adventofcode.com/2025/day/4>, :white_check_mark: Solver: [`PrintingDepartment`](src/printing_department.rs)
## Tests
The package contains unit tests for each solver to help troubleshoot issues and prevent regressions. These tests cover the solutions for provided examples and full data inputs. The solutions used within the tests are user-specific.