key-value swap

Return the given object but with its key-value swapped.

Sample Code:

function swapKeyValue(obj) {
// Enter your logic here...
}

Examples:

Input: {key:'value'}
Output: {value:'key'}
Explanation: The key has been swapped with value in the object.

Input: {lang:'Javascript',lang2:'Java'}
Output: {Javascript: 'lang',Java:'lang2'}
Explanation: The key has been swapped with value in the object.

Test Case	Input	Expected Output
Test Case 1	{key:'value'}	{value:'key'}
Test Case 2	{lang:'Javascript',lang2:'Java'}	{Javascript: 'lang',Java:'lang2'}

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