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* Refactor * fix clang * fix clang * fix clang tests * fix pattern * add test case null * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/test/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumberTest.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * rename MAP_OF_CHARS to KEYPAD * fix clang * remove main * add tests * feat: throw for wrong inputs * change keypad to list * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * fix with number 1 (empty value), and add tests * style: avoid concatenation while populating `KEYPAD` * change to assertEquals --------- Co-authored-by: Samuel Facchinello <samuel.facchinello@piksel.com> Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com>