99. Check if the String Numeric or Alphabetic

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

void classify_string(const char *str) {
    int i = 0;
    if (str[i]>='0'&&str[i]<='9') {
        while (str[i]!='\0') {
            if (str[i]<'0'&&str[i]>'9') {
                printf("MIXED");
                return;
            }
            i++;
        }
        printf("NUMERIC");
        return;
    }
    else if ((str[i]>='A' && str[i]<='Z') || (str[i]>='a' && str[i]<'z')){
        while (str[i]!='\0') {
            if (str[i]<'A' || (str[i]>'Z' && str[i]<'a') || str[i]>'z'){
                printf("MIXED");
                return;
            }
            i++;
        }
        printf("ALPHABETIC");
        return;
    }
    else printf("NUMERIC");
    return;
}

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;
}