export function emptyToNull(value?: string | null): string | null {

  if (value == null) return null;

  const trimmed = value.trim();

  return trimmed.length ? trimmed : null;

}



export function normalizeEmail(value?: string | null): string | null {

  const v = emptyToNull(value);

  return v ? v.toLowerCase() : null;

}



/** Keep digits and leading + for Iranian/international numbers. */

export function normalizePhone(value?: string | null): string | null {

  const v = emptyToNull(value);

  if (!v) return null;

  const cleaned = v.replace(/[^\d+]/g, '');

  return cleaned.length ? cleaned : null;

}