Remove Duplicate Characters from a String

Code

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

int findChar(char *str, char * insertPtr, char c) {
    int ret=0;
    while (str < insertPtr) {
        if (*str == c) 
            return 1;
        str++;
    }
    return 0;
}
void remove_duplicates(char *str) {
	//Your logic here
    char *insertPtr=str, *peekPtr=str;
    
    while (*peekPtr != '\0') {
        if (findChar(str, insertPtr, (char) (*peekPtr))) {
            peekPtr++;
        }
        else {
            *insertPtr = *peekPtr;
            insertPtr++;
            peekPtr++;
        }
    }
    *insertPtr = '\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

use pointers to copy a string unto itself minus the repeating chars