Consider what happens if you give strdup(), findx(), and strcmp() an argument that is not a C-style string. Try it! First figure out how to get a char* that doesn’t point to a zero-terminated array of characters and then use it (never do this in real — non-experimental — code; it can create havoc). Try it with free-store-allocated and stack-allocated “fake C-style strings.” If the results still look reasonable, turn off debug mode. Redesign and re-implement those three functions so that they take another argument giving the maximum number of elements allowed in argument strings. Then, test that with correct C-style strings and “bad” strings.