C Code for deleting repeated characters in a sentence

C Program to delete duplicate characters in a string/sentence
//C code for removing repeated characters of a string/sentence
#include<stdio.h>
#include<string.h>
int main()
{
char a[200];
int i,j,k,n;

printf("Enter a few chars and strings:\n");
gets(a);
printf("\nEntered string is :%s \n",a);

printf("\nUpdated string without repeated characters is\n");
n=strlen(a);
for(i=0;i<n;i++)
{
   for(j=i+1;j<n;)//mind it no icrement
   {
      if(a[j]==a[i])
      {
         for(k=j;k<n;k++)
{
             a[k]=a[k+1];
}
          n--;//else array will contain 0 in deleted duplicate value
      }
      else
         j++;
   }
}

for(i=0;i<n;i++)
    printf("%c",a[i]);
printf("\n");
}
/*
Enter a few chars and strings:
india is great aa bb cc dd ee ff gg hh ii jj kk

Entered string is :india is great aa bb cc dd ee ff gg hh ii jj kk

Updated string without repeated characters is

inda sgretbcfhjk
*/