98. Convert String to Integer

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

int custom_atoi(const char *str) {
    int result = 0;
    bool isNegative = false;
    if((*str == '+') || (*str == '-')){
        if(*str == '-'){
            isNegative = true;
        }
        str++;
    }
    while(*str != '\0'){
        if((*str >= '0') && (*str <= '9')){
            result = (result * 10) + (int)(*str - '0');
        }
        else{
            break;
        }
        str++;
    }
    if(isNegative){
        result = 0 - result;
    }
    return result;
}

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;
}