/in/foo.c: In function 'main':
/in/foo.c:10:2: warning: implicit declaration of function 'Insert' [-Wimplicit-function-declaration]
  Insert(a,n,t);
  ^~~~~~
/in/foo.c: In function 'Insert':
/in/foo.c:27:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^