Count Alphabets Digits and Symbols in a String

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

void classify_chars(const char *a, uint8_t *alpha, uint8_t *digit, uint8_t *symbol) 
{
    int i=0;
    while(a[i])
    {
      if(a[i]>=48 && a[i]<=57) //checking if current character is digit or not.
        (*digit)++;
      else if( (a[i]>=65 && a[i]<=90) || (a[i]>=97 && a[i]<=122) )
        (*alpha)++; 
      else if(a[i]!=' ')
        (*symbol)++;

      i++; 
    }
}

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;
}