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Check whether a string contains another string and concatenate

Check whether a string contains another string and concatenate

// Write a function that takes two strings (a and b) as arguments
// If a contains b, append b to the beginning of a
// If not, append it to the end
// Return the concatenation
			function
				myFunction
				(
				a, b
				)
				{
			
				
				
return 

			}

Test Cases:

myFunction('cheese', 'cake')

Expected

'cheesecake'

myFunction('lips', 's')

Expected

'slips'

myFunction('Java', 'script')

Expected

'Javascript'

myFunction(' think, therefore I am', 'I')

Expected

'I think, therefore I am'