Adijata-skripta-zad 54-ubaci br u string

#include <stdio.h>
#include <stdlib.h>

void unos(char *s) {
    int i=0;
    char c;
    do {
            c=getchar();
            s[i]=c;
            i++;
       } while (c!='\n' && i<100);

       s[i-1]='\0';
}
int length (char *s) {
    int duzina=0;
    while (*(s++)!='\0') duzina++;
    return duzina;
}

void PretvoriBrojUString(char *s,int n) {
   int br=obrni(n);
    int i=0;
    while (br!=0) {
        s[i]=br%10+'0';
      br/=10;
      i++;
    }
    s[i]='\0';

}
int obrni (int n) {
    int nb=0;

    while (n!=0) {
            nb=nb*10+n%10;
    n/=10;
    }
    return nb;
}

void insert(char *string, char *word, int indeks)
{
    int i;
    for(i = length(string) + length(word); i >= indeks + length(word); i--)
    {
        string[i] = string[i - length(word)];
    }

    for(i = 0; i < length(word); i++)
    {
        string[i + indeks] = word[i];
    }
}

void UbaciBrUString (char *s, int n) {

char broj[50];
PretvoriBrojUString(broj,n);
int i=0, poc, kraj, duzina=length(s);
for (i=0; i<duzina; i++) {
        while (s[i]!=' ') i++;
        poc=i;
        insert(s,broj,poc);
        i+=length(broj);
}}



int main () {
    char s[100];
    unos(s);
    UbaciBrUString(s,123);
    printf("%s", s);
    return 0;
}