Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    char alpha[26];
    int cap = 0;

    char * c = str;
    bool removed = 0;

    while(*c != '\0'){
        removed = 0;
        for(int i = 0; i<cap; i++){
            if(alpha[i] == *c | *c == (alpha[i]+32)){
                char * temp = c;
                removed = 1;
                while(*temp != '\0'){
                    *temp = *(temp+1);
                    temp++;
                }
                // break;
            }
        }

        if(!removed){
            alpha[cap] = *c;
            cap++;
            c++;
            
        }
   
    }
}



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