Difficulties with creating the Cartesian product of a pointer to char pointer?

There are a couple of issues. Firstly you allocate a char*. You then assign it to a char** and expect it to have 2 dimensionality.

It doesn't. You'd need to malloc a set of char* pointers (4 * whatever your pointer size is ... ie sizeof( char* )) then malloc 5 bytes for each of those pointers.

Char str5; in Permute is on the stack and lost after you exit Permute. Outputk will point to an undefined place once you exit Permute.

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