Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    int hash[256]={0};
    int read=0, write=0;
    while(str[read]!='\0'){

        if(hash[str[read]]==0){
            hash[str[read]]=1;
        str[write]=str[read];
        write++;
    }
    read++;
    }
    str[write]='\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