String Rotation Checker

You are given two strings. Your task is to determine if the second string is a rotation of the first string. A rotation means that the second string can be obtained by moving some characters from the start of the first string to the end, in the same order. If both strings are equal, return 'Yes'. If they are not of the same length, return 'No'. Otherwise, return 'Yes' or 'No' based on the rotation check. Example Input: abcd, cdab Example Output: Yes