fixed filtering on connected user

added tests and updated demo data

internal/api/routes.go

@@ -15,7 +15,12 @@ import (
 
 func GetMyBooksHanderl(c *gin.Context, db *gorm.DB) {
 	var userbooks []model.UserBook
-	db.Preload("Book").Find(&userbooks)
+	user, err := getAuthenticatedUser(c, db)
+	if err != nil {
+		manageDefaultError(c, err)
+		return
+	}
+	db.Preload("Book").Where("user_id = ?", user.ID).Find(&userbooks)
 	var booksDto []bookUserGet
 	for _, userbook := range userbooks {
 		booksDto = append(booksDto, fromUserBookDb(&userbook))