public string Guardar(Persona o)
 {
     var r = new PersonaRepository();
     r.save(o);
     return String.Format("Id: {0}, Name: {1}, Lastname: {2}, age: {3}, sexo: {4}, comentarios: {5}, habilidades : {6}",
         o.id, o.name, o.lastname, o.age, o.gender, o.comments, String.Join(", ", o.habilities));
 }
 public void save(Persona persona)
 {
     // Save
 }