How would you do this in Photoshop?

I want to take a crescent-moon shaped image and ';straighten'; it out a bit so that it is not as curved, more nearly straight. The straightened figure will be longer than the original.How would you do this in Photoshop?
Go to FILE%26gt;NEW%26gt; BLANK FILE%26gt;OK


Go to FILE%26gt;DUPLICATE %26gt;OK


Use PAINT BUCKET to Colour one file[say black]


Go to CLONE STAMP TOOL and select Hard Edged BRUSH


Make the circle the size that you want


If you want a white moon on a black surface place the CLONE BRUSH[circle] over the White sheet %26gt;Hold down ALT and Click


Move BRUSH over Black Blank file and click twice.


A White Circle appears on the Black Background


Increase the size of the BRUSH a little


ALT CLICK the larger Circle over the Black Background


Place the Circle over the other smaller white Circle leaving the creascant that you want ...





Now go to FILTER %26gt;DISTORT%26gt;LIQUIFY


Then make the circle about the same size as the inside of the creasant and gently ease the creasant to the shape that you want


Simple?