Refactor: Restructure project

- Add an internal folder where all the internal code lives
- Make a state.go and state_test.go for the public interface

This gives a more clear separation between functions and modules. It
also makes this a more typical Go project setup.

1 files changed, 0 insertions, 0 deletions

diff --git a/internal/test_data/empty b/internal/test_data/empty
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/internal/test_data/empty