Answer Posted / smbrd

&#65279;#include <iostream>

using namespace std;

void rev_str(char* str, int pos=-1, char c='\0'){
if(pos >= int(strlen(str)/2))
return;
if(c != '\0'){
str[strlen(str) - pos - 1] = str[pos];
str[pos] = c;
}
rev_str(str, ++pos, str[strlen(str) - pos - 2]);
}

int main(){
char str[] = "reverse this string";
cout << str << endl;
rev_str(str);
cout << str << endl;
//:~
return 0;
}

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