func (c MathUtil) Add(str1 string, str2 string) string {
dec1 := dec.Dec{}
dec1.SetString(str1)
dec2 := dec.Dec{}
dec2.SetString(str2)
result := dec.Dec{}
result.Add(&dec1, &dec2)
return result.String()
}
/**
return x / y
*/
func (c MathUtil) Quo(str1 string, str2 string, scaler dec.Scaler, rounder dec.Rounder) string {
dec1 := dec.Dec{}
dec1.SetString(str1)
dec2 := dec.Dec{}
dec2.SetString(str2)
result := dec.Dec{}
result.Quo(&dec1, &dec2, scaler, rounder)
return result.String()
}