String to Token C - Complier Desgin

#include<bits/stdc++.h>

int main(){
    char str[100] = "This is sample sentence";

    const char s[2] = " ";
    char* token;

    token = strtok(str, s);

    while(token != NULL){

        printf("%s\n", token);

        token = strtok(NULL, s);

    }
    return 0;

}


-------------------- with out strtok ------------

#include <stdio.h>
#include <stdbool.h>
#include <ctype.h>

static bool readLine (const char* data, const char** beginPtr, const char** endPtr) {
    static const char* nextStart;
    if (data) {
        nextStart = data;
        return true;
    }
    if (*nextStart == '\0') return false;
    *beginPtr = nextStart;

    // Find next delimiter.
    do {
        nextStart++;
    } while (*nextStart != '\0' && *nextStart != ' ');

    // Trim whitespace.
    *endPtr = nextStart - 1;
    while (isspace(**beginPtr) && *beginPtr < *endPtr)
        (*beginPtr)++;
    while (isspace(**endPtr) && *endPtr >= *beginPtr)
        (*endPtr)--;
    (*endPtr)++;

    return true;
}

int main (void) {
    const char* data = "This is sample sentence";
    const char* begin;
    const char* end;
    readLine(data, 0, 0);
    while (readLine(0, &begin, &end)) {
        printf("%.*s\n", end - begin, begin);
    }
    return 0;
}


----------------- Delimiting-------------

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

int main ()
{
  char str[] ="- This, a sample string.";
  char * pch;
  printf ("Splitting string \"%s\" into tokens:\n",str);
  pch = strtok (str," ,.-");
  while (pch != NULL)
  {
    printf ("%s\n",pch);
    pch = strtok (NULL, " ,.-");
  }
  return 0;
}