Space Delimeter - C

#include <stdio.h>
#include <string.h>

int main(){
    char s[100], d[100];
    memset(d,0,sizeof(d));
    char tokenizer[] = {" \t\f\n"};

    scanf("%[^\n]",s);
    char * pch;
    pch = strtok(s,tokenizer);
    while (pch != NULL){
        strncat(d,pch,strlen(pch));
        strncat(d," ",1);
        pch = strtok(NULL,tokenizer);
    }
    d[strlen(d)-1]='\0';
    printf("Res:\n");
    puts(d);
}