In this challenge, you will be given a string that may have mixed uppercase and lowercase letters and your task is to convert that string to either lowercase only or uppercase only based on:
- making as few changes as possible
- if the string contains equal number of uppercase and lowercase letters, convert the string to lowercase.
For example: solve("coDe") = "code". Lowercase characters > uppercase. Change only the "D" to lowercase. solve("CODe") = "CODE". Uppercase characters > lowecase. Change only the "e" to uppercase. solve("coDE") = "code". Upper == lowercase. Change all to lowercase.
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