/bin/bash^M: bad interpreter: No such file or directory

the ^M is the key to the solution here.... invalid line endings

Windows & Linux use different EOL encoding...

in Notepad++ open the file and then select one according to the runtime host OS

• Edit > EOL Conversion > Linux(LF)
• Edit > EOL Conversion > Windows (CR LF)
• Edit > EOL Conversion > Macinstosh (CR)