Convert String to Integer

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

int custom_atoi(const char *str) {
    // Your logic here
    int i=0,sign=1,result=0;

    if(str[0]=='-' || str[0]=='+')
    {
        if(str[0]=='-') sign = -1;
        i++;
    }
    if(str[i]<'0' || str[i]>'9')
        return 0;

    while(str[i]!='\0')
    {
        if(str[i]>='0' && str[i]<='9')
        {
            result = (result*10)+(str[i]-'0');
        }
        else
            break;
        i++;
    }

    return result*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;
}