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Sun Apr 18 2021 01:14:31 GMT+0000 (Coordinated Universal Time)

Saved by @David1989 #javascript

let input = "Hi, Human";
const vowels = ['a', 'e', 'i', 'o', 'u'];
let resultArray = [];
for (let i = 0; i <= input.length; i++){
  for (let j = 0; j < vowels.length; j++){
    if(vowels[j] === input[i]){
      if(vowels[j] === 'e'){
        resultArray.push('ee');
      } else if (vowels[j] === 'u'){
        resultArray.push('uu');
      } else{
        resultArray.push(vowels[j]);
      }
    }
  }
}
console.log(resultArray.join('').toUpperCase());

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