/in/foo.c: In function 'main':
/in/foo.c:15:2: 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:16:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(c);
  ^~~~
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:21:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    for (int j = i; j < strlen(s) - 1; j++)
    ^~~
/in/foo.c:23:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     l--;
     ^
/tmp/ccfzjtnu.o: In function `main':
foo.c:(.text.startup+0x17): warning: the `gets' function is dangerous and should not be used.