Please check my code. I wrote everything correctly, my code does not work

Tell us what’s happening:

Your code so far


function whatIsInAName(collection, source) {
  
  for(let key in source){
    // console.log(source)
    for(let k in collection){
      // console.log(collection[k])
      if(collection[k].hasOwnProperty(key) && source[key] == collection[k][key]){
       return collection[k];
      }
    }
  }
}

console.log(whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" }));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou