How to create a static const array of const char*

Try

static const char* const values[];

The idea is to put the two consts on either side of *: the left belongs to char (constant character), the right belongs to char* (constant pointer-to-character)

You wrote const const instead of static const char* const values[]; (where you define the pointer and the underlying values as const)

Also, you need to initialize it:

static const char* const values[] = {"string one", "string two"};