foo.c: In function 'main':
foo.c:39:30: warning: passing argument 1 of 'strlen' from incompatible pointer type [-Wincompatible-pointer-types]
   39 |         int length1 = strlen(a);
      |                              ^
      |                              |
      |                              int *
In file included from foo.c:2:
/nix/store/rffag931pvbdiabwwa539wnwg1piqpx0-glibc-2.35-163-dev/include/string.h:407:35: note: expected 'const char *' but argument is of type 'int *'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
foo.c:40:30: warning: passing argument 1 of 'strlen' from incompatible pointer type [-Wincompatible-pointer-types]
   40 |         int length2 = strlen(b);
      |                              ^
      |                              |
      |                              int *
In file included from foo.c:2:
/nix/store/rffag931pvbdiabwwa539wnwg1piqpx0-glibc-2.35-163-dev/include/string.h:407:35: note: expected 'const char *' but argument is of type 'int *'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~

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