Task #171 - Fix an arrow function

Fix the function sum is helper.js.
When imported into solution.js it should return the sum of two numbers
Don’t use curly braces and return statement

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helper.js

sum = (x, y) => return x - y;

solution.js

import { sum } from './helper.js';

console.log(sum(2, 2));       // 4
console.log(sum(4, 3));       // 7