# Развернуть строку (например "Abc" -> "cbA")
def invert_string(string):
    str_left = ""
    str_right = ""

    for i in range(len(string)//2):
        str_left += string[-i-1]
        str_right = string[i] + str_right
    if len(string) % 2 > 0:
        return str_left + string[len(string)//2] + str_right

    return str_left + str_right


#################################################
def verifier(test_name, actual, expected):
    print(test_name)
    if actual != expected:
        print("=======> FAILED! <=======")
        print(f"Got value <{actual}>")
        print(f"Expected value is <{expected}>")
    else:
        print("PASSED")
    print()


test_string1 = "The World is not enough"
test_string2 = "Testing is key"

test_palindrome1 = "Sir, I demand, I am a maid named Iris"
test_palindrome2 = "Satire: Veritas"
test_palindrome3 = "Saippuakivikauppias"

string_tests = [test_string1, test_string2, test_palindrome1, test_palindrome2, test_palindrome3, '']

for i in range(len(string_tests)):
    verifier(f"INVERT_STRING TEST {i+1}", invert_string(string_tests[i]), string_tests[i][::-1])