Introduce Chars

This improves the implementation by introducing a class to manage the characters

src/ilp_keyboard_layout_optimization/optimize.py

@@ -12,11 +12,10 @@ $ python -m ilp_keyboard_layout_optimization.optimize
 We might add command line parameters at a later time. For now please edit the main
 function at the very bottom of this file to change inputs.
 """
+from ilp_keyboard_layout_optimization.data_aquisition.chars import Chars
 from ilp_keyboard_layout_optimization.ilp import KeyboardOptimization
 from ilp_keyboard_layout_optimization.type_aliases import LinCosts, QuadCosts
 
-from src.ilp_keyboard_layout_optimization.data_aquisition.chars import Chars
-
 
 def prepare_costs(
     optimization_problem: KeyboardOptimization,