/in/foo.c: In function 'Insert':
/in/foo.c:28:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0; i<n; i++)
  ^~~
/in/foo.c:34:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   for(i=n-1; i>=k; i--) //!!!!
   ^~~
/in/foo.c:27:9: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int i, k;
         ^