Given a string representing the curves on a skeleton track, determine the difficulty of the track.
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The given string will only consist of the letters:
"L" for a left turn"R" for a right turn"S" for a straight segment
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Each direction change adds 15 points (an "L" followed by an "R" or vice versa).
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All other curves add 5 points each (all other "L" or "R" characters).
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Straight segments add 0 points.
The difficulty of the track is based on the total score. Return:
"Easy" if the total is 0 - 100"Medium" if the total is 101-200"Hard" if the total is over 200