How can I make this code better?

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Javascript

How could this be done better or more elegant ? Below is my solution and according to the evaluation of the exercise it works and i passed but i feel like code is too crude.

Here is the exercise:

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Write a function cutComment that takes one line of JavaScript and returns a possible line comment trimmed. If the line contains no line comment, null should be returned. For simplicity, we assume that the code does not contain the comment characters within a string.

Example: cutCommt('let foo; // bar') should return 'bar'.

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so you see my code works but i feel like there is maybe better solution. thanks.

What I have tried:

const cutComment = string => {

let onlyComment = string.indexOf('//');

if (string.indexOf('/') < 1) {

return null;

}

return string.substr(onlyComment+2).trim();

}