/in/foo.c: In function 'insert':
/in/foo.c:20:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0;i<n;i++)
  ^~~
/in/foo.c:24:5: 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:19:6: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int k,i;
      ^