BigInteger를 유닛 문자열로 변환하는 함수

UnitIntegerExtensions.cs

using System.Numerics;
using UnityEngine;

public static class UnitIntegerExtensions
{
    public static string ToUnitString(this BigInteger b)
    {
        if (b < 1000)
        {
            return b.ToString();
        }

        var unitNumber = Mathf.FloorToInt((float)BigInteger.Log10(b)) / 3;

        var significand = Mathf.FloorToInt((float)BigInteger.Divide(b, BigInteger.Pow(10, unitNumber * 3 - 2))) / 100f;
        var unit = (char)('A' + unitNumber - 1);

        return $"{significand:N2}{unit}";
    }
}