98. Convert String to Integer

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

int custom_atoi(const char *str) {

   // Your logic here
   int num =0;
   int sign =1;
   while(*str != '\0')
   {

    if(((*str>='A') && (*str<='Z')) || ((*str>='a') && (*str<='z')))
    {
        return num*sign;
    }
    else if(*str == '-')
    {
       sign = -1;
    }
    else if(((*str >= '0') && (*str <= '9')))
    {
        num = num*10 + (int)(*str - '0');
    }
    str++;
   }
    return num*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;
}