wip: custom logger and error handler

internal/types/error.go

@@ -0,0 +1,13 @@
+package types
+
+import "fmt"
+
+type Error struct {
+	Messages []string
+	Code     int
+}
+
+func (err Error) Error() string {
+	return fmt.Sprintf("%v",
+		err.Messages)
+}