0_0_9646352_28807.cpp: In function `std::string add(char*, char*)':
0_0_9646352_28807.cpp:13: error: `i' undeclared (first use this function)
0_0_9646352_28807.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9646352_28807.cpp:37: error: `s1' undeclared (first use this function)
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