Main.c: In function 'main':
Main.c:17:9: error: 'retu' undeclared (first use in this function)
   17 |         retu
      |         ^~~~
Main.c:17:9: note: each undeclared identifier is reported only once for each function it appears in
Main.c:17:13: error: expected ';' at end of input
   17 |         retu
      |             ^
      |             ;
Main.c:17:9: error: expected declaration or statement at end of input
   17 |         retu
      |         ^~~~