/in/foo.c: In function 'main':
/in/foo.c:9:2: warning: implicit declaration of function 'MoveLeft' [-Wimplicit-function-declaration]
  MoveLeft(a,n,k);
  ^~~~~~~~
/in/foo.c: In function 'MoveLeft':
/in/foo.c:24:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^