fix big num

http.go

@@ -312,30 +312,54 @@ func (web *WebServicer) Calculate(w http.ResponseWriter, r *http.Request) {
 
 	requestAmountAsInt, err := strconv.ParseInt(requestAmountAsStr, 10, 64)
 
+	// if err != nil {
+	// 	http.Error(w, err.Error(), http.StatusBadRequest)
+	// 	return
+	// }
+
+	// currentAmount, err := strconv.ParseInt(currentAmountStr, 10, 64) //  strconv.Atoi(currentAmountStr)
+	// if err != nil {
+	// 	http.Error(w, err.Error(), http.StatusBadRequest)
+	// 	return
+	// }
+
+	// everyTxAmountAsInt, err := strconv.ParseInt(everyTxAmountAsStr, 10, 64) // strconv.Atoi(everyTxAmountAsStr)
+	// if err != nil {
+	// 	http.Error(w, err.Error(), http.StatusBadRequest)
+	// 	return
+	// }
+
+	// txNum, err := strconv.ParseInt(txNumStr, 10, 64) //strconv.Atoi(txNumStr)
+	// if err != nil {
+	// 	http.Error(w, err.Error(), http.StatusBadRequest)
+	// 	return
+	// }
+
+	requestAmount, err := decimal.NewFromString(requestAmountAsStr)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
 
-	currentAmount, err := strconv.ParseInt(currentAmountStr, 10, 64) //  strconv.Atoi(currentAmountStr)
+	currentAmount, err := decimal.NewFromString(currentAmountStr)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
 
-	everyTxAmountAsInt, err := strconv.ParseInt(everyTxAmountAsStr, 10, 64) // strconv.Atoi(everyTxAmountAsStr)
+	everyTxAmount, err := decimal.NewFromString(everyTxAmountAsStr)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
 
-	txNum, err := strconv.ParseInt(txNumStr, 10, 64) //strconv.Atoi(txNumStr)
+	txNum, err := decimal.NewFromString(txNumStr)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
 
-	res := decimal.NewFromInt(requestAmountAsInt).Add(decimal.NewFromInt(currentAmount)).Sub(decimal.NewFromInt(everyTxAmountAsInt).Mul(decimal.NewFromInt(txNum)))
+	res := requestAmount.Add(currentAmount).Sub(everyTxAmount.Mul(txNum))
 
 	fmt.Printf("len(resAsJson): %v \n", res.String())