feat:Add SHA256 Hashing and Input Length Validation #112
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New Features and Enhancements:
1.Added SHA256 Hashing Functionality:
Implemented a new Sha256 method in the helper module to support SHA256 hashing.
Accepts input via URI parameter and returns the SHA256 hash as a hexadecimal string.
2.Improved Input Validation:
Updated the md5Request struct to include a maximum input length constraint (max=1024).
Ensures that input strings exceeding the specified limit are rejected with a clear error response.