public IActionResult Multiplication(string firstNumber, string secondNumber)
{
if (UtilNumber.IsNumeric(firstNumber) && UtilNumber.IsNumeric(secondNumber))
{
var sum = UtilNumber.ConvertToDescimal(firstNumber) * UtilNumber.ConvertToDescimal(secondNumber);
return(Ok(sum.ToString()));
}
return(BadRequest("Invalid input."));
}