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char* concat(char *&dest, const char *src) {	char* str;	//str = (char *) malloc((strlen(dest) + strlen(src) + 1) * sizeof(char)); // andra forsta strcat till strcpy!	str = (char *) calloc(strlen(dest) + strlen(src) + 1, sizeof(char));	strcat(str, dest);	strcat(str, src);	return dest = str;}