Make all text file content in one line if a space found

[santa1234]

Make all text file content in one line if space found after a word, number, or special character


1. I have a text file with thousands of short lines. If space is found say a (tab)
is a space (tab)
here.

#Now I want to make it all in a single line together if a space (tab)
is found after the last word in every line.

The output will look like the below:

1. I have a text file with thousands of short lines. If space is found say a is a space here.

#Now I want to make it all in a single line together if a space is found after the last word in every line.

Ps. I also want to delete all extra spaces after this.

https://www.youtube.com/channel/UCnxwq2aGJRbjOo_MO54oaHA
https://www.youtube.com/watch?v=SIDLFRkUEIo&lc=UgzTF5vvB67Zbfs9qvx4AaABAg
https://www.youtube.com/watch?v=v_1iqtOnUMg&lc=UgxLtKj969oiIu7zNb94AaABAg
https://www.youtube.com/watch?v=f7xZivqLZxc&lc=Ugxq4JHRza_zx3sz0fx4AaABAg
https://www.youtube.com/watch?v=f7xZivqLZxc&lc=Ugxq4JHRza_zx3sz0fx4AaABAg
https://www.youtube.com/watch?v=f7xZivqLZxc&lc=UgzMCQUIQgrbec400jl4AaABAg
https://www.youtube.com/watch?v=LuAipOW8BNQ&lc=Ugz0Uy2bCSCTb1W-0_14AaABAg
https://www.youtube.com/watch?v=ITI1HaFeq_g&lc=Ugx12mI-a39T41NaZ8F4AaABAg.9iDQqIP56NV9iFD0AkeeJG
https://www.youtube.com/watch?v=vXyMScSbhk4&lc=Ugxa2VYHMWJWXA6QI294AaABAg. 9irLgSdeU3r9itU7zdnWHw
https://www.youtube.com/watch?v=tPRv-ATUBe4&lc=UgzFkoI0n_BxwnwVMcZ4AaABAg
https://www.youtube.com/watch?v=LuAipOW8BNQ&lc=Ugz0Uy2bCSCTb1W-0_14AaABAg.9htChVuaX9W9htG01cKBzX
https://www.youtube.com/watch?v=LuAipOW8BNQ&lc=Ugw6UrV69zpeKvLOeOV4AaABAg. 9ht16tzryC49htJ6TpIOXR
https://www.youtube.com/watch?v=LuAipOW8BNQ&lc=UgwMKwGZpDjv7vi7pCx4AaABAg
https://www.youtube.com/watch?v=LuAipOW8BNQ&lc=Ugw6UrV69zpeKvLOeOV4AaABAg. 9ht16tzryC49htOKs4jh3M
https://www.youtube.com/watch?v=LuAipOW8BNQ&lc=UgxVW-am20rQ5GFuJ9F4AaABAg
https://www.youtube.com/channel/UCnxwq2aGJRbjOo_MO54oaHA