resolve plural form

resolvePluralForm.ts

export function resolvePluralForm(count: number) {
  const lastNumber = count % 10
  const lastNumbers = count % 100

  if (lastNumber === 1 && lastNumbers !== 11) return 'one'

  if (lastNumber > 1 && lastNumber < 5 && (lastNumbers < 10 || lastNumbers > 20)) return 'few'

  return 'many'
}