Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    // Your logic here
    int i = 0;
    int cnt[2] = {0};
    while (str[i] != '\0') {
        if ('0' <= str[i] && str[i] <= '9') {
            cnt[0]++;
        }
        else if ('A' <= str[i] && str[i] <= 'Z' || 'a' <= str[i] && str[i] <= 'z') {
            cnt[1]++;
        }
        i++;
    }
    if (cnt[0] == strlen(str)) {
        printf("NUMERIC");
    }
    else if (cnt[1] == strlen(str)) {
        printf("ALPHABETIC");
    }
    else {
        printf("MIXED");
    }
}

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;
}

Solving Approach