Build an in-memory cloud file storage emulator that processes a sequence of commands and returns a result for each command. Input: an array of commands, where each command is an array of strings: [COMMAND, arg1, arg2, ...]. Output: an array of strings, one entry per command, containing the command's return value. The system supports four functional stages (each stage must pass all tests to proceed): Stage 1 — Basic file operations: - ADD_FILE : create a file at path with given size (bytes). Fail if a file already exists at that path. Return "true" or "false". - COPY_FILE : copy a file from srcPath to dstPath. Fail if source does not exist, source is a directory (only files exist in tests), or destination already exists. Copy preserves owner and compressed suffix. Return "true" or "false". - GET_FILE_SIZE : return the file size as a string, or "" if missing. Stage 2 — Search: - FIND_FILE : return a comma-separated list of matching file paths with sizes formatted as "()". Match files whose full path starts with prefix and ends with suffix. Sort matches by size descending, breaking ties lexicographically ascending by path. Return "" if none. Stage 3 — Users and capacities: - ADD_USER : add a user with capacity (bytes). Fail if userId exists. Return "true" or "false". - ADD_FILE_BY : create a file owned by userId. Fail if user missing or adding exceeds user's capacity. On success return remaining capacity (capacity - used) as string; on failure return "". - UPDATE_CAPACITY : set user's capacity. If the user's current stored files exceed the new capacity, delete files owned by that user until under the limit. Deletion order: largest files first; tie-break: alphabetical by path. Return the number of files deleted as a string, or "" if user doesn't exist. Notes: files added with plain ADD_FILE are owned by "admin" (unlimited capacity). COPY_FILE preserves the owner of the source file. Stage 4 — Compression: - COMPRESS_FILE : if the file belongs to userId and is not already compressed (filename ending with ".COMPRESSED"), rename it by appending ".COMPRESSED" and halve its size (rounded down only if necessary by using integer division). Return remaining capacity for the user as string; return "" on failure. - DECOMPRESS_FILE : if the file belongs to userId and its name ends with ".COMPRESSED", attempt to revert name by removing the suffix and restore size to double the compressed size. Fail if uncompressed name conflicts with an existing file or restoring would exceed user's capacity. Return remaining capacity as string; return "" on failure. Example (combined): Input: [["ADD_USER","u1","100"],["ADD_FILE_BY","u1","/a/f.txt","40"],["COMPRESS_FILE","u1","/a/f.txt"],["GET_FILE_SIZE","/a/f.txt.COMPRESSED"],["FIND_FILE","/",".COMPRESSED"]] Possible output: ["true","60","80","20","/a/f.txt.COMPRESSED(20)"] All state is kept in memory; no real filesystem calls are required.