C-Program to Remove Repeated Words in String

#include<stdio.h>

#include<string.h>

int main()

{

    int i=0,j=0,k=0,a,minIndex=0,maxIndex=0,max=0,min=0;

    char str1[100]={0},substr[100][100]={0},c;

    printf("Enter a sentence\n");

    gets(str1);

    while(str1[k]!='\0')//for splitting sentence

    {

        j=0;

        while(str1[k]!=' '&&str1[k]!='\0')

        {

            substr[i][j]=str1[k];

            k++;

            j++;

        }

        substr[i][j]='\0';

        i++;

        if(str1[k]!='\0')

        {

            k++;

        }       

    }

    int len=i;

    //Removing repeated words same as removing repeated elements in arrays

    for(i=0;i<len;i++)

    {

      for(j=i+1;j<len;)

       {

         if(strcmp(substr[i],substr[j])==0)

          {    

             for(k=j;k<len;k++)

              {

                strcpy(substr[k],substr[k+1]);

              }

                len--;

           }

          else

           {

             j++;

           }

        }

     }

 for(i=0;i<len;i++)

 {

  printf("%s ",substr[i]);

 }

 printf("\n");   

}