Error while writing strcat() using pointers

Question

I am trying to learn C with The C programming Language by K&R. I am trying to write a the strcat() program using pointers.

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Answer 1

The program tries to append characters to the literal string "stack". Don't do that; create an array of characters that's large enough to hold the result, copy the first string into the array, and then strcat the rest of the string.

Oh, and name your function something other than strcat. That name is already taken.