Function next

pub fn next(date: Date, counter: i64) -> (Date, i64)

Next function is for the decides next day, next month, next year Takes a Date returns a date

/// # Exemple

use daysbetweendates::date::{Date, next};
let mut date = Date::from([31,12,1999]);
let mut counter = 0;
println!("{}/{}/{}",date.day, date.month, date.year);
(date, counter) = next(date, counter);
println!("{}/{}/{} -> {}",date.day, date.month, date.year, counter);