为什么我得到“格式'％s'期望'char *'类型的参数但是......”错误在这里？

I'm pretty new to C and still catching onto the basics. I am writing a very simple practice exercise which takes a phrase and reverses it. I'm sure there are other problems with this code, but primarily on compilation of main.c, I am continually getting the error I'm pretty new to C and still catching onto the