How do I split the string that fgets() returns into words?

Question

SEE EDIT

I execute the command "ls" with popen and then I get the output of it with fgets. What I want to do is separate each file/dir name and move it into an array of strings.

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

int main(void){
    char op[BUFSIZ]; 
    char words[BUFSIZ][BUFSIZ]; 

    int i = 0, j = 0, cnt = 0;

    FILE *ls = popen("ls", "r");

    // split files and dirs names 
    fgets(op, strlen(op), ls);
    for(i=0;i<=(strlen(op));i++) {
        if (op[i] == ' ' || op[i] == '\0') {
            words[cnt][j] = '\0';
            cnt++;
            j = 0; 
        }
        else {
            words[cnt][j] = op[i];
            j++;
        }
    }
    pclose(ls);

    while(words[i]!=NULL){
        printf("%s", words[i]);
    }
    
    
}

EDIT here's the updated code. Replaced sizeof with strlen, replaced BUFSIZ, added i++ in the while loop

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

int main(void){
    char op[100]; 
    char words[100][100]; 

    int i=0, j=0, cnt=0;

    FILE *ls = popen("ls", "r");

    // split files and dirs names 
    fgets(op, sizeof(op), ls);
    printf("%s", op);
    for(i=0;i<=(strlen(op));i++) {
        if (op[i] == ' ' || op[i] == '\0') {
            words[cnt][j] = '\0';
            cnt++;
            j = 0; 
        }
        else {
            words[cnt][j] = op[i];
            j++;
        }
    }
    pclose(ls);

    while(words[i]!=NULL){
        printf("%s", words[i]);
        i++;
    }
    return 0;
}