#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <locale.h>
 
int main()
{
    char * text = "öçşğü";
    int i=0, char_len;
 
    setlocale(LC_CTYPE, "en_US.utf8");
 
    while ((char_len = mblen(&text[i], MB_CUR_MAX)) > 0)
    {
        /* &text[i] contains multibyte character of length char_len */
        if(memcmp(&text[i], "ö", char_len) == 0)
        {
            printf("ö \n");
        }
 
        i += char_len;
    }
 
    return 0;
}

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