some polish on strings

lib/src/result.rs

@@ -0,0 +1,10 @@
+/// A result combines a boolean success value with
+/// an error response.  It is equivalent to `Result<bool, ()>`.
+/// cbindgen:prefix-with-name
+/// cbindgen:rename-all=ScreamingSnakeCase
+#[repr(C)]
+pub enum TCResult {
+    True,
+    False,
+    Error,
+}