export function mostFrequentChar(text: string): string {

  const map = new Map<string, number>()

  text.split('').forEach(letter => {
    const current = map.get(letter)
    if (current) map.set(letter, current + 1)
    else map.set(letter, 1)
  })

  const mostObj = Object.fromEntries(map)
  let letter = ''
  let counter = 0

  for (const key in mostObj) {
    if (mostObj[key] > counter) {
      counter += mostObj[key]
      letter = key
    }
  }

  return letter;
}