write a function to receive a whole number and return the max digit

public int getMaxDigit(int number)
{
  var result = 0;
  var num = number;
  while(num > 0)
  {
    var digit = number % 10;
    if(result < digit)
    {
      result = digit;
    }
    
    num = num / 10;
  }
  
  return result;
}

getMaxDigit(5678);