'''
Write a function to find the longest common prefix string amongst an array of strings.

If there is no common prefix, return an empty string "".

Example 1:

Input: strs = ["flower" ,"flow" ,"flight"]
Output: "fl"
Example 2:

Input: strs = ["dog" ,"racecar" ,"car"]
Output: ""
Explanation: There is no common prefix among the input strings.

'''

strs = ["flower", "flow", "flight"]
