#include "string_utils.h"
#include <stdio.h>

int main() {
    char str1[] = "    Hello World    ";
    printf("Original: '%s'\n", str1);
    printf("Trimmed: '%s'\n", trim(str1));
    
    const char* original = "Hello World";
    char* replaced = str_replace(original, "World", "Universe");
    if (replaced) {
        printf("Replaced: %s\n", replaced);
        free(replaced);
    }
    
    char str2[] = "Hello World";
    to_lowercase(str2);
    printf("Lowercase: %s\n", str2);
    
    return 0;
}