Converting celsius to fahrenheit challenge

Hi guys.why is this code not passing

  **Your code so far**

function convertToF(celsius) {
let fahrenheit;
return fahrenheit;
}
fahenheit = celsius * 9/5 + 32

convertToF(30);
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Firefox/97.0

Challenge: Convert Celsius to Fahrenheit

Link to the challenge:

You have to define fahrenheit here:

not here:

thanks.passed the test