Added canonical title diff

utils/AnimeTitleDiff.go

@@ -0,0 +1,22 @@
+package utils
+
+// AnimeTitleDiff describes differing titles.
+type AnimeTitleDiff struct {
+	TitleA string
+	TitleB string
+}
+
+// String returns the description.
+func (diff *AnimeTitleDiff) String() string {
+	return "Titles are different"
+}
+
+// DetailsA shows the details for the first anime.
+func (diff *AnimeTitleDiff) DetailsA() string {
+	return diff.TitleA
+}
+
+// DetailsB shows the details for the second anime.
+func (diff *AnimeTitleDiff) DetailsB() string {
+	return diff.TitleB
+}