99. Check if the String Numeric or Alphabetic

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

void classify_string(const char *str) {
    // Your logic here
    uint8_t i = 0;
    uint8_t j = 0;
    uint8_t k = 0;
    while( str[i] != '\0')
    {
        if( str[i] >= '1' && str[i] <= '9')
        {
            i++;
        }
        else
        {
            break;
        }
    }
    while( str[j] != '\0')
    {
       if( (str[j] >= 'A' && str[j] <= 'Z') || (str[j] >= 'a' && str[j] <= 'z'))
       {
         j++;

       } 
       else
       {
        break;
       }
    }
    if( str[i] == '\0')
    {
        printf("NUMERIC\n");
    }
    else if( str[j] == '\0')
    {
        printf("ALPHABETIC\n");
    }
    else
    {
        printf( "MIXED\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;
}