Separates given string into groups separated by the separator provided

separate.ts

export const separate = (value: string, groupCount: number, separator = ' ') => { 
  if ((value === undefined || value === null) || (groupCount === null || groupCount === undefined)) {
     throw new Error('value and groupCount are required');
  }
  let reuslt = '';
  value.split('').forEach((c, i) => {
    const currentPos = i + 1;
    let isSeparatable = currentPos % groupCount === 0 && currentPos !== value.length;
    if (isSeparatable) {
      reuslt = `${reuslt}${c}${separator}`;
    } else { 
      reuslt = `${reuslt}${c}`;
    }
  });
  return reuslt;
};