Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    char stir[256]={0};// this is to map what we have seen!!
    char res[101]={0};// this to build the output
    char *t =str;
    int i=0; // index for the res
    while(*t){
        if(stir[*t]==0){
        stir[*t]+=1;
        res[i++]=*t;
        }
        ++t;
    }
    res[i]='\0';
    i=0;
    while(res[i]){
        *str=res[i++];
        ++str;
    }
    *str='\0';
    }


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