Is it possible to automate the replacement of a paragraph with a space in text on MacOS?

Question

macOS

Hey! I ask for help in solving the following. question:
How can I write a program / script on a computer with macOS, which can automatically, when entering text into it, exclude all transitions to a new line (paragraphs) and replace them with spaces. Preferably with subsequent suggestions to copy the finished text to the clipboard, or if it is possible to automatically copy the finished text to the clipboard.

Thank you!
PS
The level of knowledge of the questioner is to strive for not complete zero.