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extern char *utf8_prev_char (const char *string_start, const char *string);
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extern char *utf8_next_char (const char *string);
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extern int utf8_char_int (const char *string);
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extern wint_t utf8_wide_char (const char *string);
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extern int utf8_char_size (const char *string);
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extern int utf8_strlen (const char *string);