Remove duplicate string in C

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This program is about to remove deplicate string and print the string from the given string using strings.

Source Code

#include<stdio.h>
int main()
{
  int i,j,k;
  char a[100];
  printf("\nEnter the String:");
  gets(a);
  for(i=0;i<strlen(a);i++)
  {
    for(j=i-1;a[i]!='\0';i++)
    {
      if(a[j]==a[i])
      {
        for(k=j;a[k]!='\0';k++)
        {
           a[k]=a[k+1];
        }
      }
    }
  }
  printf("\nThe final String after removing all Duplicates;%s",a);
  return 0;
}

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Output

Enter the String:abacdce
The final String after removing all Duplicates:abcde

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