foo.cc: In function 'void StringReplace(std::string&, std::string&, std::string&)':
foo.cc:48:25: warning: unused variable 'nEnd' [-Wunused-variable]
   48 |         int nStart = 0, nEnd = 0;
      |                         ^~~~
foo.cc: In function 'int main(int, char**)':
foo.cc:66:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   66 |         gets(ary_cParent);
      |         ~~~~^~~~~~~~~~~~~
In file included from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/cstdio:42,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/ext/string_conversions.h:43,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/basic_string.h:3968,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/string:53,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/locale_classes.h:40,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/ios_base.h:41,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/ios:42,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/ostream:38,
                 from iostream:39:
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:67:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   67 |         gets(ary_cSub);
      |         ~~~~^~~~~~~~~~
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:68:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   68 |         gets(ary_cReplace);
      |         ~~~~^~~~~~~~~~~~~~
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: /tmp/ccaxKYTc.o: in function `main':
foo.cc:(.text.startup+0x91): warning: the `gets' function is dangerous and should not be used.

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