## Refactoring: [Name]

**Problem:** [Description]
**Goal:** [Desired outcome]
**Risk Level:** [Low/Medium/High]

### Prerequisites
- [ ] Tests exist and pass
- [ ] Code is committed
- [ ] Dependencies identified

### Steps
1. [First small change]
2. [Run tests]
3. [Next small change]
4. [Run tests]
...

### Validation
- [ ] All tests pass
- [ ] No functionality changed
- [ ] Code is cleaner

function printOwing(invoice) {
  let outstanding = 0;
  
  console.log("***********************");
  console.log("**** Customer Owes ****");
  console.log("***********************");
  
  for (const o of invoice.orders) {
    outstanding += o.amount;
  }
  
  console.log(`name: ${invoice.customer}`);
  console.log(`amount: ${outstanding}`);
}

function printOwing(invoice) {
  printBanner();
  const outstanding = calculateOutstanding(invoice);
  printDetails(invoice, outstanding);
}

function printBanner() {
  console.log("***********************");
  console.log("**** Customer Owes ****");
  console.log("***********************");
}

function calculateOutstanding(invoice) {
  return invoice.orders.reduce((sum, o) => sum + o.amount, 0);
}

function printDetails(invoice, outstanding) {
  console.log(`name: ${invoice.customer}`);
  console.log(`amount: ${outstanding}`);
}

class Person {
  name;
  officeAreaCode;
  officeNumber;
  
  getTelephoneNumber() {
    return `(${this.officeAreaCode}) ${this.officeNumber}`;
  }
}

class TelephoneNumber {
  areaCode;
  number;
  
  toString() {
    return `(${this.areaCode}) ${this.number}`;
  }
}

class Person {
  name;
  telephoneNumber;
  
  getTelephoneNumber() {
    return this.telephoneNumber.toString();
  }
}