Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	int i = 0;
    int k = 0;
    int count[256] = { 0 };

    while(str[i])
    {
        if(!count[str[i]])
        {
            str[k++] = str[i];
            count[str[i]] = -1;
        }
        i++;
    }
    str[k] = '\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