export function toCapitalCase(value: string): string
export function toCapitalCase(value: null): null
export function toCapitalCase(value: undefined): undefined
export function toCapitalCase(
  value: string | null | undefined
): string | null | undefined {
  if (!value) return value

  value = value.trim()
  if (!value) return value

  return value[0].toUpperCase() + value.slice(1).toLowerCase()
}