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#include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
using namespace std;
char* MyStrcat(char dstStr[],char srcStr[]) {
int len1 = strlen(dstStr);
int len2 = strlen(srcStr);
char *res = new char[len1+len2+1];
int len = 0;
for(int i = 0; i < len1; i++) res[len++] = dstStr[i];
for(int i = 0; i < len2; i++) res[len++] = srcStr[i];
res[len] = '\0';
return res;
}
int main() {
string str1,str2;
while(cin >> str1 >> str2) {
char* dst = new char[str1.length() + 1];
char* src = new char[str2.length() + 1];
strcpy(dst, str1.c_str());
strcpy(src, str2.c_str());
 ...
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