Convert String to Integer

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

int custom_atoi(const char *str) {
    int i = 0;
    int result=0;
    int sign= +1;

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