# "Ручной" аналог функции replace()
def replace_string(string, to_find, to_replace):
    result = ""
    ln_find = len(to_find)
    ln_str = len(string)

    i = 0
    while i < ln_str:
        if i + ln_find <= ln_str:
            found = True
            for j in range(ln_find):
                if to_find[j] != string[i + j]:
                    found = False
                    break

            if found:
                result += to_replace
                i += ln_find
            else:
                result += string[i]
                i += 1
        else:
            result += string[i]
            i += 1

    return result


#################################################
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_replace_string1 = "The World is not enough"
test_replace_string2 = "Testing is key"
test_replace_string3 = "Sir, I demand, I am a maid named Iris"
test_replace_string4 = "Satire: Veritas"
test_replace_string5 = "Brum Brum Brum Brum "

replace_string_tests = [test_replace_string1, test_replace_string2, test_replace_string3, test_replace_string4, test_replace_string5, '']


for i in range(len(replace_string_tests)):
    to_find = ' '
    to_replace = '#'
    verifier(f"SPLIT_STRING (FIND='{to_find}', REPLACE='{to_replace}') TEST {i+1}",
             replace_string(replace_string_tests[i], to_find, to_replace),
             replace_string_tests[i].replace(to_find, to_replace))

for i in range(len(replace_string_tests)):
    to_find = 'no'
    to_replace = 'NO'
    verifier(f"SPLIT_STRING (FIND='{to_find}', REPLACE='{to_replace}') TEST {i+1}",
             replace_string(replace_string_tests[i], to_find, to_replace),
             replace_string_tests[i].replace(to_find, to_replace))

for i in range(len(replace_string_tests)):
    to_find = ' is '
    to_replace = 'BLUB'
    verifier(f"SPLIT_STRING (FIND='{to_find}', REPLACE='{to_replace}') TEST {i+1}",
             replace_string(replace_string_tests[i], to_find, to_replace),
             replace_string_tests[i].replace(to_find, to_replace))

for i in range(len(replace_string_tests)):
    to_find = 'Brum '
    to_replace = ''
    verifier(f"SPLIT_STRING (FIND='{to_find}', REPLACE='{to_replace}') TEST {i+1}",
             replace_string(replace_string_tests[i], to_find, to_replace),
             replace_string_tests[i].replace(to_find, to_replace))