98. Convert String to Integer

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

int custom_atoi(const char *str) {
    int num = 0;
    int flag = 1;
    if(*str == '+'){
        flag = 1;
        str++;
    }
    else if(*str == '-'){
        flag = 0;
        str++;
    }
    while ((*str >=48 && *str <=57)){

        num = num*10 + (*str - '0');
        str++;
    }
    if (flag){
        return num;
    }
    else{
        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;
}