Reverse Character Groups
Problem Description
Given a string of digits and letters, reverse each group of 3 characters. If a group has less than 3 characters, reverse the entire string.
Example 1
Input
abcdef
Output
cbafed
Explanation: Reversing each group of 3 characters: 'abc' becomes 'cba' and 'def' becomes 'fed', resulting in 'cbafed'
Example 2
Input
abcdefghi
Output
cbadefihg
Explanation: Reversing each group of 3 characters: 'abc' becomes 'cba', 'def' becomes 'fed', and 'ghi' becomes 'ihg', resulting in 'cbadefihg'
Example 3
Input
ab
Output
ba
Explanation: Since the label length is less than 3, the entire label is reversed, resulting in 'ba'
Constraints
- Input string should be a unique alphanumeric identifier.
- The length of the input string should be between 1 and 100.
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