770. Basic Calculator IV

Given an expression such as expression = "e + 8 - a + 5" and an evaluation map such as {"e": 1} (given in terms of evalvars = ["e"] and evalints = [1]), return a list of tokens representing the simplified expression, such as ["-1*a","14"] - An expression alternates chunks and symbols, with a space separating each chunk and symbol. - A chunk is either an expression in parentheses, a variable, or