#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *trim(char *str) {
	int i=0, spbefore=0, slen=0, spafter=0;
	char *newstr;

	slen = strlen(str);

	while (str[i] == ' ') {
		spbefore++;
		i++;
	}

	i=slen-1;
	while (str[i] == ' ') {
		spafter++;
		i--;
	}

	//slen-spbefore-spafter = a trimmelt lanc hossza
	//+1 a lezaro 0-nak
	newstr = (char *)malloc((slen-spbefore-spafter+1) * sizeof(char));
	if (newstr == NULL) { return NULL; }

	for (i=0; i < slen-spafter-spbefore; i++) {
		newstr[i] = str[i+spbefore];
	}

	newstr[i] = 0;

	return newstr;

}

int main() {
	char *trimmed;

	trimmed = trim("        foobarRRR      ");

	printf("|%s|\n", trimmed);

	free(trimmed);
	trimmed = NULL;

    return 0;
}