Modified files
Added test for checkInput and function
Made test for checkInput for string and modified function checkInput()
Added test for checkInput for symbols
Added test for checkInput for a char
Added test for a input for the number nine and modified checkInput
Added test for input for the number one
Added test to check input for the number five
Added test for checkInput that is too small
Added test for checkInput for a negative number
Added test for checkInput for a number that is too big
Refactoring for checkInput
More refactoring for checkInput
Added a Test for new function playerMove()
Added test to move player to a marked field and modified function movePlayer()
Test to move a player to the same field twice
Refactoring for movePlayer()