/in/foo.c: In function 'main':
/in/foo.c:10:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(s);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c: In function 'Delete':
/in/foo.c:24:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  else if((si+len-1)<n)
       ^~
/in/foo.c:27:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   for(i=si+len;i<n;i++)
   ^~~
/tmp/ccmwm2kL.o: In function `main':
foo.c:(.text.startup+0x11): warning: the `gets' function is dangerous and should not be used.