Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	unsigned int asciiTable[128] = {0};
    int idx=0,newIdx=0;
    while(*(str+idx)!='\0'){
        char carac = *(str+idx);
        (asciiTable[carac])++;
        if((asciiTable[carac])==1) *(str+newIdx)=carac,newIdx++;
        idx++;
        }
        *(str+newIdx)='\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