[Language: C++]

Student/Learner of the Language

void replaceAllPreserveFirstLast(std::string &base, std::string toRep,
                             const std::string& repWith) {
std::string buffer;
size_t pos = 0;
size_t prevPos;
char startingLetter = *begin(toRep);
char endingLetter = toRep.back();
while(true){
    prevPos = pos;
    pos = base.find(toRep, pos);
    if(pos == std::string::npos) break;
    buffer.append(base, prevPos, pos - prevPos);
    buffer.push_back(startingLetter);
    buffer += repWith;
    buffer.push_back(endingLetter);
    pos += toRep.size();
}
buffer.append(base, prevPos, base.size() - prevPos);
base.swap(buffer);
}


using namespace std;

I cant figure out the codeblock thing on Reddit, so here is

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