Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    // Your logic here
    int alpha_count =0;
    int num_count =0;
    int other_count =0;
    while(*str !='\0')
    {
        if(*str -'0' >= 0 && *str - '0' <= 9)
            num_count++;
        else if(*str >= 'A' && *str <='Z' || *str >='a' && *str <='z')
            alpha_count++;
        else
            other_count++;
        *str++;
    }
    if(alpha_count>0 && num_count==0 && other_count==0)
        printf("ALPHABETIC");
    else if(alpha_count==0 && num_count>0 && other_count==0)
        printf("NUMERIC");
    else
        printf("MIXED");
}

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