Modify Variable Names :
Difficulty Level : Easy
Submissions : 86
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You are given a string $$$S$$$ representing a variable name in either C++ or Java as per the following rules :
- In C++, variables are named using snake_case, i.e., spaces between multiple words are replaced by an underscore '_' character, and the first letter of each word is written in lowercase. For example, my_variable is a valid C++ variable name.
- In Java, variables are named using camelCase, which indicates the separation of words with a single capitalized letter, and the first word starting with lower case. For example, myVariable is a valid Java variable name.
Note : Assume that a Java variable name never contains '_' before any alphabet. In other words, if the given variable name contains '_' before any alphabet, treat the given variable name as a C++ variable name and vice versa.
Your task is to convert a C++ variable name into a Java variable name and vice versa.
The first line of input contains an integer $$$t \hspace{2 pt}(1 \le t \le 10^4)$$$ — the number of testcases. The description of $$$t$$$ testcases follows.
The first line of each testcase contains an integer $$$n \hspace{2 pt} (1 \le n \le 10^5)$$$ — the length of string $$$S$$$.
The second line of each testcase contains a string of length $$$n$$$ denoting the variable name in either C++ or Java.
The strings consist of lowercase and uppercase latin letters and underscores '_' and it is guaranteed that the sum of lengths of strings over all testcases does not exceed $$$10^5$$$.
For each testcase, print the converted variable name in a single line.
215thisIsAVariable18this_is_a_variable
this_is_a_variable thisIsAVariable
In sample testcase 1, the given string is a Java variable name and hence we convert it into C++ variable name separating the words with underscores.
In sample testcase 2, the given string is a C++ variable name and hence we convert it into Java variable name by using camelCase notation. Note that "ThisIsAVariable" is not a valid Java variable name.
