Problem with strlen() and UTF8 characters

 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
int main(){
        char *s;
        s = (char *) malloc(sizeof(char)*100);
 
        scanf("%s", s);
        printf("Len: %d\n", strlen(s));
 
        return 0;
}