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I need to convert this code to using pointers only. No arrays other than to declare...

I need to convert this code to using pointers only. No arrays other than to declare the pointers. I am having serious difficulty with this.

void encryptStrings(char strings[NUM_STRINGS][STRING_LENGTH], int key)
{
   for (int i = 0; i < NUM_STRINGS; i++)
   {
       for (int j = 0; j < STRING_LENGTH; j++)
       {
           strings[i][j] += key;
       }
   }
}

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