trimBlankLines
Removes the leading and trailing blank lines of a string, preserving any other whitespace.
Example: "\n\n Hello \n \n" ->" Hello "
Return
this string without its leading and trailing blank lines
Removes the leading and trailing blank lines of a string, preserving any other whitespace.
Example: "\n\n Hello \n \n" ->" Hello "
this string without its leading and trailing blank lines