code: def longest_common_prefix_v1(strs):
      if not strs:
          return ""
      result = strs[0]
      for i in range(len(strs)):
          result = common_prefix(result, strs[i])
      return result
  
label_desc: Use image node_id 2 for calling a global function with example usage: longest_common_prefix_v1(strs) and returns: result, str