Letter Case Permutation
Explore how to generate all possible letter case permutations of a string containing letters and digits. This lesson helps you understand modifying each letter independently to either lowercase or uppercase while preserving digits. Gain practical experience implementing these variations to strengthen your skills in subset and permutation problems using C#.
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Statement
Given a string, s, consisting of letters and digits, generate all possible variations by modifying each letter independently to be either lowercase or uppercase while keeping the digits unchanged. Each letter in the s string can appear in both cases across different variations, resulting in multiple possible combinations. Return a list containing all such variations in any order.
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