Handle zero input in expandedForm - #105
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Motivation
expandedForm(0)produced an empty buffer and thensubstring(0, result.length() - 3), causing aStringIndexOutOfBoundsException, so the helper must handle zero robustly.Description
"0"immediately whenexpandedForm(int num)is invoked withnum == 0, preserving existing behavior for other inputs insrc/main/java/kyu6/NumberInExpandedForm.java.zeroShouldRemainZeroinsrc/test/java/kyu6/NumberInExpandedFormTest.javathat assertsexpandedForm(0)returns"0".Testing
mvn -Dtest=NumberInExpandedFormTest testwhich executed the class-specific tests and they passed (2 tests, 0 failures).mvn testand all automated tests passed (598 tests, 0 failures or errors).Codex Task