The char_dict should be made global so it is accessible to all the functions.
Function: base_score ---> renamed from point_conversion
Purpose: Calculates base score of a given word
Acceptance Criteria:
- Returns base score of the word.
Function: multiplier_score
Purpose: Calculates score of a given word including any letter/word tiles multipliers passed
Acceptance Criteria:
- Returns total score of the word
- Must account for any multiplier tiles.