<reponame>kolyasalubov/Lv-677.PythonCore
# CodeWars Double_char

def double_char(s):
    result = ""
    for i in s:
        result += i*2
    return result

# CodeWars Double_char

def double_char(s):
    result = ""
    for i in s:
        result += i*2
    return result
# CodeWars Double_char