Convert Javascript function into C (again)

Having been let down by two developers on this, please do not bid if you are unwilling to complete. I know that sounds a strange thing to say, but both developers have been awarded the project but both never accepted it (in the allotted time) nor returned any of my emails. Third time lucky! This project is to simply convert Javascript code into the equivalent C. The javascript simply takes a number of geocoded points (longitude, latitude) and returns the points required to make a concave hull (not a convex one). I require the same functionality and input parameters but in a C version as this will be running on a server as opposed to a client facing computer. The information for the concave hull javascript function can be found here [login to view URL], with the actual source code here [login to view URL] The only difference is that the input points are floats as opposed to integers and are to be read in via a file (as opposed to hard coded). An example file is attached. Following on from several conversations. The software will be running on a linux server and would need to be compiled locally (either through makefiles or a simple gcc command). The conversion does not need to be a one to one copy of the javascript but simply accept the same parameters and produce the same output. The output will be simply a list of geocoded points that would construct the polygon. Requesting it in C such that it will run server side as opposed to client side and run as fast as possible. The javascript version will deal with 52,000 points in about half a second on a 3GHz 8GB quad core computer.