Fix conditional statements (#32)

* Fix conditional statements

* Update tokenizer.ts

Author: JJtan2002

src/parser.ts

@@ -141,7 +141,7 @@ export class Parser {
         const startToken = this.peek();
         const statements: Stmt[] = [];
         while (!this.isAtEnd()) {
-            if (this.match(TokenType.NEWLINE)) {
+            if (this.match(TokenType.NEWLINE) || this.match(TokenType.DEDENT)) {
                 continue;
             }
             statements.push(this.stmt());

src/tokenizer.ts

@@ -265,12 +265,19 @@ export class Tokenizer {
                 while (this.isDigit(this.peek())) {
                     this.advance();
                 }
+                
+                if (this.peek() !== '.' && this.peek() !== 'e') {
+                    this.addToken(TokenType.BIGINT);
+                    return;
+                }
+                
                 if (this.peek() === '.') {
                     this.advance();
                     while (this.isDigit(this.peek())) {
                         this.advance();
                     }
                 }
+                
                 if (this.peek() === 'e') {
                     this.advance();
                     if (this.peek() === '-') {