Convert String to Integer

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

int custom_atoi(const char *str) {
    // Your logic here
    int i = 0;
    int num = 0;
    while (str[i] != '\0') {
        if (str[i] == '-' || str[i] == '+') {
        }
        else if ('0' <= str[i] && str[i] <= '9') {
            num = num * 10 + str[i] - '0';
        }
        else {
            if (str[0] == '-') {
                num = -num;
            }
            break;
        }
        i++;
    }
    return num;
}

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;
}