I want to concatenate an array inside another array.
Input = [['a', 'b'], ['c', 'd']]
Output: ['ab', 'cd']
Input = [['a', 'b'], ['c', 'd'], ['f', '.']]
Output: ['ab', 'cd', 'f.']
Conditions:
- All arrays are string arrays
- The array's length can be any value
- At the end, I should have just one array, not array of arrays