Write player movement for a 2d Unity game

Hello, I'm building a mobile 2D multiplayer game using Unity3D and I would like a Freelancer to create the player movement functions. There are three (3) movements: left - right - jump - The more a player walks into one direction the more he moves fast. - The more he moves fast, the more he jumps higher. - A player can move left and right while in the air. - The player movements must be real smooth and stop as soon as Unity intercepts the key_up signal. The functions must be developed in C# As well as developing those functions, you must provide the algorithm to calculate the next player player's coordinate position. Your algorithm must not use any function from any C# lib (mathf excepted) or Unity lib. You may use any web oriented language library (JS/Python...) library. Exemple: void MyPlayerMoveLeft(){ //Player will move left once when this function is called // You can use any function you want } float MyPlayerNewXPosition(){ // You can't use any unity function and c# lib except mathf lib return (NewPlayerX); } If MyPlayerNewXPosition() is called, it will return what the next player's X coordinate would have been if MyPlayerMoveLeft() would have been called. Thank you for your interest