Convert String to Integer

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

int custom_atoi(const char *str) {
    // Your logic here
    int value=0;
    int sign=1;
    if(str==0)
        return 0;
    if(*str=='+')
    {
        str++;
    }
    else if(*str=='-')
    {
        sign=-1;
        str++;
    }
    
        while(*str>='0'&& *str<='9')
        {
            value = value*10 + (*str-'0');
            str++;
        }
    
    return sign*value;
}

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;
}