functional

fn main() {
    let numbers = vec![1, 2, 3, 4, 5];

    let sum: i32 = numbers
        .iter()
        .filter(|&&x| x % 2 == 0)

module Result
  def self.Success(value)
    Success.new(value)
  end

  def self.Failure(error)

import java.math.BigDecimal;
import java.time.LocalDate;
import java.util.List;

import Transaction.Category;