foo.cc: In member function 'void SeqString::Index(SeqString&)':
foo.cc:33:13: error: 'strlen' was not declared in this scope
   33 |    if (j == strlen(ss.buff))
      |             ^~~~~~
foo.cc:4:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include <cstdio>
  +++ |+#include <cstring>
    4 | using namespace std;
foo.cc: In function 'int main()':
foo.cc:47:2: error: 'gets_s' was not declared in this scope; did you mean 'gets'?
   47 |  gets_s(s1);
      |  ^~~~~~
      |  gets

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