Substring/ASCII value at main · 312arjun/Substring · GitHub

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def modify_string(s):
    modified_chars = set()
    modified_string = ""

    for i in range(len(s)):
        ascii_value = ord(s[i])

        if ascii_value % 2 == 0:
            new_ascii = ascii_value + (ascii_value % 7)
            if chr(new_ascii) not in modified_chars and new_ascii >= 0 and new_ascii <= 127:
                modified_string += chr(new_ascii)
                modified_chars.add(chr(new_ascii))
            else:
                modified_string += chr(83)
        else:
            if i > 0:
                new_ascii = ascii_value - (ascii_value % 5)
                if chr(new_ascii) not in modified_chars and new_ascii >= 0 and new_ascii <= 127:
                    modified_string = modified_string[:-1] + chr(new_ascii)
                    modified_chars.add(chr(new_ascii))
                else:
                    modified_string += chr(83)
            else:
                modified_string += s[i]

    return modified_string

s = "Testing"
modified = modify_string(s)
print(modified)