How to use X as type name in Template(X) in c

There are 2 issues in your code:

1. Missing trailing ; in return inttemplate and return footemplate.
2. Invalid ; at the end of the Template macro definition.
   It should be without ;:

   #define Template(X) Template
   

   Note that macros perform textual substitution, and so the ; you put at the end of the macro definition is a part of the text that the preprocessor will replace.

Fixed version - live demo

Note: you should generally avoid giving the same name (e.g. Template) to separate entities (here e.g. the macro and the typedef struct). Even in cases where it is valid, it can confuse readers.