Can anyone figure out why my program (in C) for splitting sentence to word didn't work?

I have written two codes for splitting sentences to words, one of which worked while other one didn't. Only difference is in the if condition under for loop. First one gave no output. While second one is giving expected output.

NOT WORKING ONE:

  #include <stdio.h>
  void main(void){
  int i=0, m=0, n=0, j, l=0;
  char sen[500], wrd[500][500];

  printf("Input a sentence:\n");
  gets(sen);

  while(sen[i]!='\0'){
  l++;
  i++;
  }

  for(i=0;i<=l;i++){
    if(sen[i] != ' '||sen[i] != '\0'){    //Here is the difference.
        wrd[m][n]=sen[i];
        n++;
    }
    else{
        wrd[m][n]='\0';
        puts(wrd[m]);
        printf("\n");
        m++;
        n=0;
    }
    }
}

WORKING ONE:

 #include <stdio.h>
 void main(void){
 int i=0, m=0, n=0, j, l=0;
 char sen[500], wrd[500][500];

 printf("Input a sentence:\n");
 gets(sen);

 while(sen[i]!='\0'){
 l++;
 i++;
 }

 for(i=0;i<=l;i++){
    if(sen[i] == ' '||sen[i] == '\0'){        //Here is the difference.
        wrd[m][n]='\0';
        puts(wrd[m]);
        printf("\n");
        m++;
        n=0;

    }
    else{
        wrd[m][n]=sen[i];
        n++;
    }
    }
}

Only difference is in the if condition of for loop. First one have: if(sen[i] != ' '||sen[i] != '\0') Second have: if(sen[i] == ' '||sen[i] == '\0')