Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    // Your logic here
    uint8_t digi = 0;
    uint8_t alpha = 0;
    uint8_t symbol = 0;
    uint8_t read = 0;
    while(str[read])
    {
        if(str[read]>=48 && str[read]<=57){
            digi = 1;
        }
        else if((str[read] >= 65 && str[read]<= 90) ||(str[read]>= 97 && str[read]<= 122)){
            alpha = 1;
        }
        else symbol = 1;
        read++;
   }
   if(digi == 1 && alpha == 0 && symbol==0)
   {
    printf("NUMERIC");
   }
   else if(digi == 0 && alpha == 1 && symbol ==0)
   {
    printf("ALPHABETIC");
   }
   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