Lexer bug causes infinite loop or parsing errors on subtraction (-) operations

[AbhaySingh2477]

Describe the bug

Any attempt to perform subtraction operations fails:

1. 3 - 5 (with spaces around the minus operator) causes an infinite loop resulting in RangeError: Invalid array length.
2. 3-5 or 3 -5 (without space after minus) gets parsed incorrectly as a negative number token ["3", "-5"] and throws Error: Unknown: ["3","-5"].

Steps to Reproduce

Run the calculator and input the following expressions:

echo "3 - 5" | node calculator.js # Causes RangeError: Invalid array length (infinite loop)
echo "3-5" | node calculator.js   # Causes Error: Unknown: ["3","-5"]