Leetcode - 6. Zigzag Conversion

The function `convert` takes a string `s` and an integer `numRows` as input and returns a string. It implements a zigzag conversion of the input string, arranging characters in a pattern determined by `numRows`. The algorithm iterates through rows, adding characters from the main vertical path and, when applicable, diagonal elements. If `numRows` is 1, the original string is returned unchanged.