Compilare: main.cpp: In function 'int main()': main.cpp:20:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i = 0; i < strlen(aux); i ++) | ~~^~~~~~~~~~~~~ main.cpp:23:20: warning: 'char* strncat(char*, const char*, size_t)' output may be truncated copying 1 byte from a string of length 1000 [-Wstringop-truncation] 23 | strncat(s, aux + i, 1); | ~~~~~~~^~~~~~~~~~~~~~~