refac: article title rules are the same in the API request and the domain; an invalid title returns 400 instead of 500

internal/infrastructure/useCases/CreateArticle.go

@@ -18,8 +18,8 @@ func NewCreateArticleUseCase(articleRepository article.Repository) *CreateArticl
 }
 
 func (g *CreateArticleUseCase) CreateArticle(createArticle CreateArticleCommand) (article.Article, error) {
-	if len(createArticle.Title) < 3 || len(createArticle.Title) > 200 {
-		return article.Article{}, article.ErrInvalidTitle
+	if err := article.ValidateTitle(createArticle.Title); err != nil {
+		return article.Article{}, err
 	}
 
 	return g.articleRepository.Create(article.Article{