create a c++ sepa.xml pain 008.001.08 tool,  no comment,  but be aware of BIC isn´t correct.  You replace BIC with BICFI.  This tool must allow,  to import hundrets of creditors, but be aware,  no fixed sums. Sums will be added

<|channel|>analysis<|message|>Need compute sum amounts from input and set total. Provide amount per creditor. Use csv with amount field. Compute CtrlSum. No comments.<|end|>

<|start|>assistant<|channel|>final<|message|>```cpp
#include <iostream>
#include <fstream>
#include <vector>
#include <sstream>
#include "tinyxml2.h"

using namespace tinyxml2;

struct Creditor{
    std::string name, iban, bicfi;
    double amt;
};

static XMLElement* textElement(XMLDocument& d,const char*s,const char*t){auto e=d.NewElement(s);e->SetText(t);return e;}

static std::vector<Creditor> load(const std::string& fn){
    std::ifstream f(fn);
    std::string l,n,i,b;
    double a;
    std::vector<Creditor> r;
    while(std::getline(f,l)){
        std::istringstream s(l); if(!std::getline(s,n,';'))continue;
        if(!std::getline(s,i,';'))continue; if(!std::getline(s,b,';'))continue;
        if(!(s>>a))continue; r.push_back({n,i,b,a});
    }
    return r;
}

int main(int ac,char**av){
    std::string csv=(ac>1)?av[1]:"creditors.csv";
    auto cr=load(csv);
    double total=0; for(auto&c:cr)total+=c.amt;

    XMLDocument d;
    auto doc=d.NewElement("Document");
    doc->SetAttribute("xmlns","urn:iso:std:iso:20022:tech:xsd:pain.008.001.08");
    d.InsertFirstChild(doc);

    auto init=d.NewElement("CstmrCdtTrfInitn"); doc->InsertEndChild(init);
    auto hdr=d.NewElement("GrpHdr"); init->InsertEndChild(hdr);
    hdr->InsertEndChild(textElement(d,"MsgId","MSG001"));
    hdr->InsertEndChild(textElement(d,"CreDtTm","2025-08-26T12:00:00+02:00"));
    hdr->InsertEndChild(textElement(d,"NbOfTxs",std::to_string(cr.size()).c_str()));
    hdr->InsertEndChild(textElement(d,"CtrlSum",std::to_string(total).c_str()));

    auto pmt=d.NewElement("PmtInf"); init->InsertEndChild(pmt);
    pmt->InsertEndChild(textElement(d,"PmtInfId","PMTINF001"));
    pmt->InsertEndChild(textElement(d,"PmtMtd","TRF"));
    pmt->InsertEndChild(textElement(d,"NbOfTxs",std::to_string(cr.size()).c_str()));
    pmt->InsertEndChild(textElement(d,"CtrlSum",std::to_string(total).c_str()));

    auto tp=d.NewElement("PmtTpInf"); pmt->InsertEndChild(tp);
    tp->InsertEndChild(textElement(d,"SvcLvl","SEPA"));
    tp->InsertEndChild(textElement(d,"LclInstrm","CORE"));
    tp->InsertEndChild(textElement(d,"SeqTp","FRST"));

    for(const auto&c:cr){
        auto tx=d.NewElement("CdtTrfTxInf"); pmt->InsertEndChild(tx);
        tx->InsertEndChild(textElement(d,"PmtId",c.name.c_str()));
        tx->InsertEndChild(textElement(d,"Amt",std::to_string(c.amt).c_str()));

        auto ca=d.NewElement("CdtrAgt");
        auto fi=d.NewElement("FinInstnId"); fi->InsertEndChild(textElement(d,"BICFI",c.bicfi.c_str()));
        ca->InsertEndChild(fi); tx->InsertEndChild(ca);

        auto cd=d.NewElement("Cdtr"); cd->InsertEndChild(textElement(d,"Nm",c.name.c_str())); tx->InsertEndChild(cd);
        auto acct=d.NewElement("CdtrAcct");
        auto id=d.NewElement("Id"); id->InsertEndChild(textElement(d,"IBAN",c.iban.c_str()));
        acct->InsertEndChild(id); tx->InsertEndChild(acct);
    }

    d.SaveFile("sepa_payment.xml");
}
```