BrojSlovaKojaSePonavljajuDvaPuta

#include <stdio.h>
#include <stdlib.h>
int Slovo(char c)
{
    if(tolower(c) >= 'a' && tolower(c) <= 'z')
        return 1;
    return 0;
}

int Brojac(char s[])
{
    int niz[25];
    int i = 0, j;
    int  brojac = 0;
    int br = 0;

    for(j = 0; j < 25; j++)
        niz[j] = 0;




    while(s[i] != '\0')
    {
        if(s[i] >= 'a' && s[i] <= 'z')
        niz[s[i] - 'a']++;
        if(s[i] >= 'A' && s[i] <= 'Z')
        niz[s[i] - 'A']++;
        i++;
    }
    int k;
    for(k = 0; k < 25; k++)
        if(niz[k] == 2) br++;
    return br;
}

int main()
{
    char s[50] = "ii aaaa bb";
    int broj = Brojac(s);

    printf("%d  ", broj);

    return 0;
}