} else if (ch == '!') {
        appendCharToStr(&token.val, ch);
        nextCh();
        if (ch == '=') {
            appendCharToStr(&token.val, ch);
            nextCh();
            return token.kind = NOT_EQUAL;
        }
        return token.kind = NOT;
    } else if (ch == '$') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = DOLLAR;
    } else if (ch == '%') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = PERCENT;
    } else if (ch == '&') {
        appendCharToStr(&token.val, ch);
        nextCh();
        if (ch == '&') {
            appendCharToStr(&token.val, ch);
            nextCh();
            return token.kind = AMPERSAND2;
        }
        return token.kind = AMPERSAND;
    } else if (ch == '(') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = LPAREN;
    } else if (ch == ')') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = RPAREN;
    } else if (ch == '*') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = ASTERISK;
    } else if (ch == '+') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = PLUS;
    } else if (ch == '-') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = MINUS;
    } else if (ch == '/') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = SLASH;
    } else if (ch == ';') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = SEMICOLON;
    } else if (ch == '<') {
        appendCharToStr(&token.val, ch);
        nextCh();
        if (ch == '=') {
            appendCharToStr(&token.val, ch);
            nextCh();
            return token.kind = LESS_EQUAL;
        }
        return token.kind = LESS;
    } else if (ch == '=') {
        appendCharToStr(&token.val, ch);
        nextCh();
        if (ch == '=') {
            appendCharToStr(&token.val, ch);
            nextCh();
            return token.kind = EQUAL2;
        }
        return token.kind = EQUAL;
    } else if (ch == '>') {
        appendCharToStr(&token.val, ch);
        nextCh();
        if (ch == '=') {
            appendCharToStr(&token.val, ch);
            nextCh();
            return token.kind = GREATER_EQUAL;
        }
        return token.kind = GREATER;
    } else if (ch == '^') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = CARET;
    } else if (ch == '{') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = LBRACE;
    } else if (ch == '|') {
        appendCharToStr(&token.val, ch);
        nextCh();
        if (ch == '|') {
            appendCharToStr(&token.val, ch);
            nextCh();
            return token.kind = VBAR2;
        }
        return token.kind = VBAR;
    } else if (ch == '}') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = RBRACE;
    } else if (ch == '~') {
        appendCharToStr(&token.val, ch);
        nextCh();
        return token.kind = TILDE;