Compilare: main.cpp: In function 'int main()': main.cpp:18:14: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(i=0;i<strlen(c);i++) | ~^~~~~~~~~~ main.cpp:34:14: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(i=0;i<strlen(c);i++) | ~^~~~~~~~~~ main.cpp:55:25: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] 55 | c2[cnt]=NULL; | ^~~~