98. Convert String to Integer

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

int custom_atoi(const char *str) {
    int num = 0;
    int sign = 1;
    if(*str == '-') {
        sign = -1; str++;
    } else if (*str == '+'){
        str++;
    }
    while(*str) {
        if(*str >= '0' && *str <= '9') {    
        num = num * (10) + *str - '0';
        } else {
            break;
        }
     str++;
    }
    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;
}