pich1package/lib/advance_math.js

I hope work

var call_count = require('./call_counter.js');

function mul(x,y) {
    call_count();
    return x * y;
}

function divi(x, y) {
    call_count();
    return x / y;
}

module.exports = {
    multiply: mul,
    division: divi
}