Revert ":lollipop: Added .gitattributes & .gitignore files"

This reverts commit 185bea6feb60d7eed17c9c58c82e7974c446d948.
fksn

find the k-th smallest number in two sorted array, the type of elements
are unsigned integers. There are two implementations in the source file,
one of them has the time complexity of O(k) and the another has O(lgm +
lgn), where m and n is the length of two arrays.