99. Check if the String Numeric or Alphabetic

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

const char* classify_string(const char *str) {

    int digit = 0;
    int charter = 0;
    int symbol=0;

    for(int i = 0; str[i] != '\0'; i++) {

        if(str[i] >= '0' && str[i] <= '9'){
            digit = 1;
        }

        else if((str[i] >= 'A' && str[i] <= 'Z') ||
                (str[i] >= 'a' && str[i] <= 'z')) {
            charter = 1;
        }
        else symbol=1;
    }

    if(digit && !charter && !symbol)
        return "NUMERIC";

    if(!digit && charter && !symbol)
        return "ALPHABETIC";

    return "MIXED";
}

int main() {

    char str[101];
    fgets(str, sizeof(str), stdin);

    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    printf("%s\n", classify_string(str));

    return 0;
}