const words = `
mango
banana


`;

// String → Array (newline se split)
const arr = words
  .split('\n')
  .map(w => w.trim())
  .filter(w => w !== '');

// 10 words per line print
for (let i = 0; i < arr.length; i += 10) {
  console.log(arr.slice(i, i + 10).join(', '));
}