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    Write a method that prints out all the combinations of the characters in a string.
    Write a method that prints out all the permutations of the characters in a string.
    Study of Binary Search, its algorithm and recursive/iterative implementations
    The concept of recursion in computer science
    Introduction to binary numbers and the binary system
    Write a method in Java that converts an int to its String representation.
    Write a method in Java that converts a String to its int representation.
    Write an efficient function that reverses the words in a strong (common interview problem).
    Write a function in Java/C# that deletes specific characters from a string.
    Write a function that finds the first non-repeated character in a given string