#include <string.h>
#include <ctype.h>

char *trim(char *str) {
    char *end;

    /* Trim leading space */
    while (isspace((unsigned char) *str)) {
        str++;
    }

    if(*str == 0) {
        /* All spaces? */
        return str;
    }

    /* Trim trailing space */
    end = str + strlen(str) - 1;
    while (end > str && (isspace((unsigned char) *end) || *end == '\r' || *end == '\n')) {
        end--;
    }

    /* Write new null terminator */
    *(end + 1) = 0;

    return str;
}