99. Check if the String Numeric or Alphabetic

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

void classify_string(const char *str) {
    char *p[] = { "NUMERIC", "ALPHABETIC", "MIXED" };
    int index = 0;
    uint8_t state = 0;

    while(str[index] != '\0') {
        if(str[index] >= '0' && str[index] <= '9') 
            state |= 1U << 0;
        if(str[index] >= 'A' && str[index] <= 'Z' || (str[index] >= 'a' && str[index] <= 'z'))
            state |= 1U << 1;
        else state |= 1U << 0;
        
        index++;
    }

    printf("%s", p[state-1]);
    
}

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++;
    }

    classify_string(str);
    return 0;
}