Reverse a string (taken from FreeCodeCamp - Basic Algorithms)

Instructions

• Reverse the provided string.
• You may need to turn the string into an array before you can reverse it.
• Your result must be a string.

Test Scenarios

• reverseString("hello") should return a string.
• reverseString("hello") should become "olleh"
• reverseString("Howdy") should become "ydwoH"
• reverseString("Greetings from Earth") should return "htraE morf sgniteerG"