Creating a new string containing a previously declared string var

I want to do something like looks like this (obviously not valid c code, though): char test[] = "you"; char new[] = "hey %s over there", test; // Want to get back "hey you over there" Here's my way, but it seems too complicated. Get the len of both the test and new, create a new string buffer that can hold both lengths, concatenate new and test to the string buffer. Is there a better way to do this? Also `char hi[] = "hi"` vs `char *hi = "hi"`. What's the difference?

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