Remove Duplicate Characters from a String

Code

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

void shifting(char *str,int start){
    while(str[start]!='\0'){
        str[start]=str[start+1];
        start++;
    }
}

void remove_duplicates(char *str) {
	//Your logic here
    int i=0;
    while(str[i]!='\0'){
        for (int j=i+1;str[j]!='\0';j++){
            if (str[i]==str[j])
                shifting(str,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