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#include <string.h>
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#include <ctype.h>
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int strncasecmp(const char *s1, const char *s2, size_t n)
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{
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if (n == 0)
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return (0);
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size_t i = -1;
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while (++i < n - 1 && s1[i] != '\0' && s2[i] != '\0'
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&& tolower(s1[i]) == tolower(s2[i])) ;
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return (tolower(s1[i]) - tolower(s2[i]));
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}
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