implement curry()

Create a curry function that accepts a function fn and returns a curried version of it. The curried function should accept arguments one at a time, and once all arguments are received (based on the original function's arity), the original function should be executed.

Example Inputs & Outputs

function sum(a, b, c) {
    return a + b + c;
}

const curriedSum = curry(sum);

curriedSum(1)(2)(3); // → 6
curriedSum(1, 2)(3); // → 6
curriedSum(1)(2, 3); // → 6
curriedSum(1, 2, 3); // → 6

Constraints & Edge Cases

• The input fn can have any number of parameters.
• The curried function must handle partial application (passing fewer args in one call).
• It should support chaining until all arguments are passed.
• If fn takes 0 arguments, it should return the result of calling fn().