#include <stdio.h>

void f(char *s1, char *s2) {
    char *p1=s1, *p2=s2, *pocetak, *kraj, *pi, *ci;

    while (*s1!='\0') {
        s2=p2;
        while (*s2!='\0') {
            if (*s1==*s2) {
                pocetak=s1;
                while (*s1==*s2 && *s2!='\0' && *s2!=' ') {
                    s1++; s2++;
                }
                if (*s2=='\0' || *s2==' ') {
                    kraj=s1;
                    pi=pocetak;
                    if (*s2==' ') ci=kraj+1;
                    else ci=kraj;
                    while (*ci!='\0') {
                        *pi=*ci;
                        pi++; ci++;
                    }
                    *pi='\0';
                }
            } s2++;
        } s1++;

    }
    s1=p1;
    while (*s1!='\0') {
        printf("%c", *s1);
        s1++;
    }
    printf("\n");
}

int main () {
    char s1[]="Jok zamijeni", s2[]="zamijeni nemoj", s3[]="zamijeni nemoj", s4[]="zamijeni jok";
    f(s1, s2);
    f(s3, s4);
    return 0;
}