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#include<iostream>#include<cstring>using namespace std;const char cstr1[] = "Hello";const char cstr2[] = "world";int main(){constexpr size_t new_size = strlen(cstr1) + strlen(" ") + strlen(cstr2) + 1;char cstr3[new_size];strcpy(cstr3, cstr1);strcat(cstr3, " ");strcat(cstr3, cstr2);cout << cstr3 << endl;return 0;}

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