Mini Calculator

/// Първо решение
function miniCalculator(firstNum,secondNum,thirdNum){
    let add=(a,b)=>{return a+b}
    let subtract=(add,c)=>{return add-c}
    console.log(subtract(add(firstNum,secondNum),thirdNum))

}
/// Второ решение
function miniCalculator(firstNum,secondNum,thirdNum){
    console.log(subtract(add(firstNum,secondNum),thirdNum))
    function add(a,b){
        return a+b
    }
    function subtract(add,c){
        return add-c
    }
}