SCL: Simple Calculator Language
Project structure:
$ tree -d
.
├── build # Build directory; where binaries (except the main one) go.
│ ├── obj # Project objects.
│ └── test # Test build directory.
│ └── obj # Test objects.
├── src # Source files (*.c).
│ └── include # Header files (*.h)
└── test # Tests (file names match those in src/*.c).
└── unity # Unity test framework files.