+ """Justify a string.
+
+ >>> justify_string('This is another test', width=40, alignment='c')
+ ' This is another test '
+ >>> justify_string('This is another test', width=40, alignment='l')
+ 'This is another test '
+ >>> justify_string('This is another test', width=40, alignment='r')
+ ' This is another test'
+ >>> justify_string('This is another test', width=40, alignment='j')
+ 'This is another test'
+
+ """