Convert String to Integer

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

int custom_atoi(const char *str) {
    // Your logic here
    int multiplier = 1;
    char * c  = (char *)(str);

    if(*str == '-'){
        multiplier = -1;
        c++;
    }else if( *str == '+'){
        multiplier = 1;
        c++;
    }

    int result = 0;
    while(*c >= '0' && *c <= '9' ){
        result *= 10;
        result += *c - '0';
        c++;
    }

    return result*multiplier;
}

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++;
    }

    printf("%d", custom_atoi(str));
    return 0;
}