You have have some spacing issues and an incorrect word.
Add this console.log at the bottom of your code so you can see the issues for yourself and fix them.
const myStr = "I am a \" double quoted \" string quotes \" double quotes \" . "; // Change this line
console.log(`Correct: I am a "double quoted" string inside "double quotes".`)
You should see this result in the console to see the errors better