feat: reformulado el generador de links para que no sean secuenciales

repository/CrearUrl.go

@@ -2,6 +2,7 @@ package repository
 
 import (
 	"fmt"
+	"math/rand/v2"
 	"url-short/models"
 
 	"gorm.io/gorm"
@@ -38,7 +39,18 @@ func CrearUrl(longURL string, db *gorm.DB) (string, error) {
 	// }
 
 	var url models.Url
-	result = db.Create(&models.Url{Longurl: longURL}).Scan(&url)
+	for {
+		url.Shorturl = rand.Int64()
+		result = db.Model(&models.Url{}).Where("shorturl = ?", url.Shorturl).Count(&counturl)
+		if result.Error != nil {
+			return "", result.Error
+		}
+		if counturl == 0 {
+			break
+		}
+	}
+
+	result = db.Create(&models.Url{Longurl: longURL, Shorturl: url.Shorturl}).Scan(&url)
 	shortURL := fmt.Sprintf("%d", url.Shorturl)
 
 	if result.Error != nil {