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Consider a language of strings that contains only X's, Y's and Z's. A string in this...

Consider a language of strings that contains only X's, Y's and Z's. A string in this language must begin with an X. If a Y is present in the string, it must be the final character of the string.

This language is specified by the following recursive grammar:

<word> = <X><U> | <X><word> | <X>Y
<U>    = X | Z
<X>    = X

implement the algorithm in a method of given class.

Below is the code given to use:

#include "XyzLanguageProcessor.h"

bool csc232::XyzLanguageProcessor::isValid(const std::string &word) const {

// TODO: Implement me using recursion

return false;

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