hed the whole Soundex algorithm all in one go, you could end up with one big, unwieldy piece of code. However, if you break down the problem into a number of different steps, each corresponding to its own helper function, you can develop these helper functions one at a time and test each one as you go.</p>

<p>For example, Step 1 of the Soundex algorithm could be implemented as a helper function that extracts only the letters from a string. The C++ library function <a href="http://en.cppreference.com/w/cpp/