Convert Uppercase Letters to Lowercase

Code

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

void to_lowercase(char *str) {
    // Your logic here
    int length = 0 ; 
    while (str[length] != '\0')
    {
        if (((int(str[length]) >= 65) && (int(str[length]) <= 90)) )
        {
            str[length] = int(str[length]) + 32;

        }
        

     length ++;  
    }

    // 
}

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++;
    }

    to_lowercase(str);
    printf("%s", str);
    return 0;
}

Solving Approach