[FEATURE] trim string / trim line

[DenuxPlays]

New feature motivation

Currently while pasting in Gitlab CI/CD variables I came across an whitespace error.

New feature description

Call str.trim() on the whole input and on each line to trim whitespaces at the end and the start of the input or the line.

New feature implementation

For whole input: input.trim()
And for each line split the input into lines and call .trim() on each line.