bool Param::open(const char *arg, const Option *opts) will cause memory leaks

[CoderHJZhao]

**fileName: param
methodName: bool Param::open(const char arg, const Option opts)

The Xcode profile tool detects memory leaks in this method, which causes continuous memory growth and overheating of the phone. I hope you can optimize this issue when you have time. Thank you!
`char *string=ptr[2];
if (string!=NULL) {
std::string str(string);
size_t f=str.find("%20");

while (f != std::string::npos) {
    str.replace(f, std::string("%20").length(), " ");
    f=str.find("%20");
}

char *file= new char[str.size()+1];
sprintf(file, "%s",str.c_str());
ptr[2]=file;

}
`

[shinjukunian]

#f0abf60 should address this