/**
 * Get the minute floor as a Base 32 string
 * @param timestamp The timestamp as a number
 * @returns {string}
 *
 * @example
 *    U.minuteFloor(1605532173) // => '1fnp540'
 */

export function minuteFloor(timestamp?: number|null): string {

  const _timestamp = (timestamp) ? timestamp : Date.now();

  return (Math.floor(_timestamp / 60000) * 60000).toString(32);
}