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) {

   while(*str != 0) {
    char ch = *str;
    if((ch >= 'A' && ch<= 'Z') ||(ch>='a' && ch<= 'z')) {
        (*alpha)++;
    } else if(ch >= '0' && ch<= '9') {
        (*digit)++;
    } else if(ch != ' '){
        (*symbol)++;
    }
    *str++;
   }  
}

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;
}