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
    *alpha = 0;
    *digit = 0;
    *symbol = 0;

    uint8_t p_index = -1;
    while (str[++p_index] != '\0') {
        uint8_t ch = str[p_index];
        if (('a' <= ch && ch <= 'z') || 'A' <= ch && ch <= 'Z') (*alpha)++;
        else if (('0' <= ch && ch <= '9')) (*digit)++;
        else if (ch != ' ') (*symbol)++;
    }
}

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;
}