Remove Duplicate Characters from a String

Code

#include <stdio.h>
#include <stdint.h>

void remove_duplicates(char *a) 
{
	int i;
    int j;

    while(a[i])
    {
        j=i+1;
        while(a[j])
        {
          if(a[i]==a[j])
          {
            int k=j+1;
            while(a[k])
            {
                a[k-1]=a[k];
                k++;
            }
            a[k-1]='\0';
          }
          j++;
        }
        i++;
    }
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    remove_duplicates(str);
    printf("%s", str);
    return 0;
}

Solving Approach