1. Reverse a string without reversing words. Later he added delimiters to the string and did not want to reverse the delimiters but just the words. 2. how would you test a video not running on youtube or netflix. Second round: 1. reverse digits in a integer both positive and negative. 2. you have an array [1,2,3,4] output as the product of all other values but not the value at that index [24,12,8,6] 3. find the pairs which adds to specific sum in an array. a[x1,x2,x3,x4] and b[y1,y2,y3,y4] x1+y1=z so print x1,y1. 4. there are two large files flie1 and file2 , merge the file with no duplicates. Write test cases for all of these questions.