refactor extractProcess to use io.ReadAll instead of bufio.Reader

[catatsuy]

This pull request includes changes to the internal/cli/cli.go file to improve the efficiency and readability of the extractProcess function. The most important changes include replacing the line-by-line reading with a single read operation and simplifying the error handling.

Code efficiency and readability improvements:

• internal/cli/cli.go: Replaced the line-by-line reading of the input stream with a single read operation using io.ReadAll, which simplifies the code and potentially improves performance.
• internal/cli/cli.go: Removed the loop and associated error handling for reading lines, as the entire input is now read at once.