Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    uint8_t numeric = 0;
    uint8_t alphabetic = 0;

    while(*str != '\0'){
        if(*str >= '0' && *str <= '9'){
            numeric = 1;
        }
        else if(*str >= 'a' && *str <= 'z'){
            alphabetic = 1;
        }
        else if(*str >= 'A' && *str <= 'Z'){
            alphabetic = 1;
        }
        else{
            printf("MIXED\n");
            return;
        }
        str++;
    }

    if(numeric && alphabetic) {printf("MIXED\n");}
    else if(numeric) {printf("NUMERIC\n");}
    else {printf("ALPHABETIC\n");}
}

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