You are given a phone number as a string number. number consists of digits, spaces ' ', and/or dashes '-'.
You would like to reformat the phone number in a certain manner. Firstly, remove all spaces and dashes. Then, group the digits from left to right into blocks of length 3 until there are 4 or fewer digits. The final digits are then grouped as follows:
\n\nThe blocks are then joined by dashes. Notice that the reformatting process should never produce any blocks of length 1 and produce at most two blocks of length 2.
\n\nReturn the phone number after formatting.
\n\n\n
Example 1:
\n\n\nInput: number = "1-23-45 6"\nOutput: "123-456"\nExplanation: The digits are "123456".\nStep 1: There are more than 4 digits, so group the next 3 digits. The 1st block is "123".\nStep 2: There are 3 digits remaining, so put them in a single block of length 3. The 2nd block is "456".\nJoining the blocks gives "123-456".\n\n\n
Example 2:
\n\n\nInput: number = "123 4-567"\nOutput: "123-45-67"\nExplanation: The digits are "1234567".\nStep 1: There are more than 4 digits, so group the next 3 digits. The 1st block is "123".\nStep 2: There are 4 digits left, so split them into two blocks of length 2. The blocks are "45" and "67".\nJoining the blocks gives "123-45-67".\n\n\n
Example 3:
\n\n\nInput: number = "123 4-5678"\nOutput: "123-456-78"\nExplanation: The digits are "12345678".\nStep 1: The 1st block is "123".\nStep 2: The 2nd block is "456".\nStep 3: There are 2 digits left, so put them in a single block of length 2. The 3rd block is "78".\nJoining the blocks gives "123-456-78".\n\n\n
\n
Constraints:
\n\n2 <= number.length <= 100number consists of digits and the characters '-' and ' '.number.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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