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*****************
ltrim() / rtrim()
*****************
Purpose
=======
ltrim
-----
ltrim(str)
Removes any spaces at the start of a given string. Input is a string, output
is the same string starting with the first non-space character.
rtrim
-----
rtrim(str)
Removes any spaces at the end of a given string. Input is a string, output
is the same string ending with the last non-space character.
Example
=======
ltrim
-----
In the following example the spaces at the beginning of the string are removed.
.. code-block:: none
ltrim(" str ")
produces
.. code-block:: none
"str "
rtrim
-----
In the following example the spaces at the end of the string are removed.
.. code-block:: none
rtrim(" str ")
produces
.. code-block:: none
" str"
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