Whitespace (leerzeichen) stört

char * str_replace(const char *from, const char *to, const char *src)
{
	char *result, *temp, *needle;
	int count, length;


	length = strlen(src);


	if (strlen(from) < strlen(to))
	{
		count = 0;
		temp  = (char *) src;


		while ((needle = strstr(temp, from)))
		{
			temp = needle + strlen(from);
			count++;
		}


		length += strlen(src) + (strlen(to) - strlen(from)) * count;
	}


	result = (char *) malloc(sizeof(char) * (length + 1));
	memset(result, 0, sizeof(char) * (length + 1));


	temp = (char *) src;
	while ((needle = strstr(temp, from)))
	{
		length = needle - temp;
		strncat(result, temp, length);
		strcat(result, to);
		temp = needle + strlen(from);
	}


	strcat(result, temp);


	return result;
}