does the task involve simplifying expressions before applying values? I'm trying to find a reason for overflow (I'm sure Wolfram pre-manipulates the expression)

I found an error in my code. The resulting string contains an "end of line" character in the middle. It seems that how the result is printed is different from what is printed using the cout function.

Now the output is following:

RESULT IS [275*+]
Expected: equal to "275*+"
Actual: "275*

To see where is your mistake, change your code to:

...
    auto out =  translate(full_expr);
    std::cout<<"RESULT IS ["<<out<<"]\n";
    return out;
}

I have following code

...
    auto out =  translate(full_expr);
    std::cout<<"RESULT IS "<<out<<"\n";
    return out;
}

an i got following output.

RESULT IS 275*+
Expected: equal to "275*+"
Actual: "275*