/* Parser a string to get a null value. If the first character after the value is different of '}' or ']' is set to '\0'.  */
static char* nullValue(char *ptr, json_t *property)
/* Parser a string to get a null value. If the first character after the value is different of '}' or ']' is set to '\0'.  */
static char* nullValue(char *ptr, json_t *property)
{
    return primitiveValue(ptr, property, "null", JSON_NULL);
}