Add And Subtract JS

function addAndSubtract(num1, num2, num3){
    function add(num1, num2) {
        return num1 + num2;
    }
    let sum = add(num1, num2);
    function subtract(sum, num3) {
        return sum - num3;
    }
    let finalResult = subtract(sum, num3)
    console.log(finalResult);
}

OR

function addAndSubtract(num1, num2, num3) {
    let sum = (num1, num2) => num1 + num2;
    let subtract = (sum, num3) => sum - num3;
    console.log(subtract(sum(num1, num2), num3));
}