Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    // Your logic here
    bool isalpha = false;
    bool isdigit = false;
    while(*str){
        if(*str>='0' && *str<='9'){
            isdigit = true;
        }
        else if(*str>='A' && *str<='Z' || *str>='a' && *str<='z'){
            isalpha=true;
        }else{
            printf("MIXED");
            return;
        }
        str++;
    }
    if(isdigit && isalpha){
        printf("MIXED");
    }else if(isdigit){
        printf("NUMERIC");
    }
    else if(isalpha){
        printf("ALPHABETIC");
    }
}

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