flipEachK should take a String and an int as input and returns a String. Let k be the name of the input integer. The output string should contain the first k characters of the input string in order, the next k characters of the input string in reverse order, the next k characters of the input string in normal order, and so on. The output string should have all the characters of the input string and no others. flipEachK("abcdefghijklmn", 4) should return "abcdhgfeijklnm"

You are allowed to use the following from the Java API:

class String

length

charAt

class StringBuilder

length

charAt

append

toString

class Character

any method