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#include <string.h>
#include "_assert.h"
/** count non-matching characters **/
size_t strcspn(const char *s1, const char *s2)
{
size_t i = 0;
ASSERT_NONNULL(s1);
ASSERT_NONNULL(s2);
for (i = 0; s1[i] != '\0'; i++) {
if (strchr (s2, s1[i]) != NULL) {
break;
}
}
return i;
}
/***
the number of characters that the beginning of
the string ARGUMENT(s1) that are not in the string ARGUMENT(s2).
***/
/*
RETURN_ALWAYS(the number of non-matching characters);
STDC(1)
*/
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