Count Alphabets Digits and Symbols in a String

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

void classify_chars(const char *str, uint8_t *alpha, uint8_t *digit, uint8_t *symbol) {
    // Your logic here
    
    uint8_t len = 0;
    
    while(*(str + len) != '\0')
    {
        if( (*(str + len) >= 'a' && *(str + len) <= 'z') || (*(str + len) >= 'A' && *(str + len) <= 'Z') )
        {
            *alpha = *alpha + 1;
        }
        else if( (*(str + len) >= '0' && *(str + len) <= '9'))
        {
            *digit = *digit + 1;
        }
        else if(*(str + len) != ' ')
        {
            *symbol = *symbol + 1;
        }

        len ++;
    }
}

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++;
    }

    uint8_t alpha = 0, digit = 0, symbol = 0;
    classify_chars(str, &alpha, &digit, &symbol);
    printf("Alphabets = %u\nDigits = %u\nSymbols = %u", alpha, digit, symbol);
    return 0;
}