foo.c: In function 'Concat':
foo.c:6:69: warning: left-hand operand of comma expression has no effect [-Wunused-value]
    6 |         for (i = strlen(s1) - 1,j=1; i < strlen(s1) + strlen(s2) - 2,j<strlen(s2); j++,i++)
      |                                                                     ^
foo.c: In function 'main':
foo.c:16:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   16 |         gets(s1);
      |         ^~~~
In file included from foo.c:1:
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.c:17:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   17 |         gets(s2);
      |         ^~~~
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: /tmp/cc1x8otR.o: in function `main':
foo.c:(.text.startup+0xb): warning: the `gets' function is dangerous and should not be used.

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