function sentencesManipulation(sentence) {
  var splitted = [];
  var splitting = '';
  var lastWord = '';

  for (var x = 0; x < sentence.length; x++) {
    if (sentence[x] === ' ') {
      splitted.push(splitting);
      splitting = '';
    } else
      splitting += sentence[x];
  }

  for (var y = 0; y < sentence.length; y++) {
    if (sentence[y] === ' ')
      lastWord = '';
    else
      lastWord += sentence[y];
  }

  splitted.push(lastWord);

  var result = [];

  for (var i = 0; i < splitted.length; i++) {
    var vocal = 'aiueo';
    var isVocal = false;

    for (var j = 0; j < vocal.length; j++)
      if (splitted[i][0] === vocal[j])
        isVocal = true;

    var temp = '';

    if (isVocal)
      temp = splitted[i];
    else {
      for (var k = 1; k < splitted[i].length; k++)
        temp += splitted[i][k];

      temp += `${splitted[i][0]}nyo`;
    }

    result.push(temp);
  }

  var final = '';

  for (var l = 0; l < result.length; l++) {
    if (l === result.length - 1)
      final += result[l];
    else
      final += `${result[l]} `;
  }

  console.log(final);
}

sentencesManipulation('ibu pergi ke pasar bersama aku');