foo.c: In function 'main':
foo.c:18:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t' {aka 'long unsigned int'} [-Wformat=]
   18 |                 printf("%d",strlen(s)-1);
      |                         ~^  ~~~~~~~~~~~
      |                          |           |
      |                          int         size_t {aka long unsigned int}
      |                         %ld

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