Convert String to Integer

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

int custom_atoi(const char *str) {
    // Your logic here
    uint8_t len = 0;
    int num = 0;
    int sign = 1;

    while(*(str + len) != '\0')
    {
        if(*(str + len) == '-')
        {
            sign = -1;
        }
        else if(*(str + len) == '+')
        {
            sign = 1;
        }
        else if(*(str + len) >= '0' && *(str + len) <= '9')
        {
            num = num * 10 + (*(str + len) - '0');
        }
        else
        {
            return (num * sign);
        }

        len ++;
    }

    return (num * sign);
}

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;
}