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#include<string>

#include<iostream>

std::ostream& alternate (std::ostream& os, const std::string& str) {

for (size_t index=0; index<str.size(); index+=2) os << str[index];

return os;

}

int main (void) {

std::string test {"The quick brown fox jumps over the lazy dog"};

alternate (std::cout, test);

std::cout << std::endl;

}

Output:

Teqikbonfxjmsoe h aydg

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