Refactor kafka to pure Go (franz-go), fix DBC stubs, update Dockerfile

pkg/can-go/internal/identifiers/char_test.go

@@ -0,0 +1,23 @@
+package identifiers
+
+import (
+	"testing"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestIsAlphaChar(t *testing.T) {
+	assert.Assert(t, IsAlphaChar('b'))
+	assert.Assert(t, IsAlphaChar('C'))
+	assert.Assert(t, !IsAlphaChar('Ö'))
+	assert.Assert(t, !IsAlphaChar('_'))
+}
+
+func TestIsNumChar(t *testing.T) {
+	assert.Assert(t, IsNumChar('0'))
+	assert.Assert(t, IsNumChar('1'))
+	assert.Assert(t, IsNumChar('2'))
+	assert.Assert(t, IsNumChar('9'))
+	assert.Assert(t, !IsNumChar('/'))
+	assert.Assert(t, !IsNumChar('a'))
+}