Convert String to Integer

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

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

    while(*str != '\0')
    {
        if(*str == '-')
            sign =- 1;
        else if(*str == '+')
            sign = 1;
        else if(*str - '0' >= 0 && *str - '0' <= 9)
        {
            digit = digit*10 + (*str -'0');
        }
        else
            break;
        *str++;
    }
    return sign*digit;
}

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;
}