# [C (gcc)], 70 bytes

<!-- language-all: lang-c -->

 o(s,a)char*s;{for(a=0;s[1];s++)a|=s[1]-*s&64|*s-s[1]&32;return a!=96;}

[Try it online!]

[C (gcc)]: https://gcc.gnu.org/
[Try it online!]: https://tio.run/nexus/c-gcc#VY7LCsIwEEX3/YoxoiS1ii8EjRV8foPPRWwiFjTVTFyI@u21UURyV3PPzJ2ZPKMYCZYchQmRPw6ZoSJucty0dhxrNSaesavrIVZ73WeIdeeqnTY3yt6MBlGK@z3@ysupTk43qWCIVqZZ4zgKglRbsAotULceQmTwCKDQxRStAyUVHEBFbjWJACMoPmGMB69v8CxSTX8Bt4WS8WQ6my9IMfNn69XSBzrzvTVK@USIfeKTq2/dnamP7gp9IJWTJJ@H8zc "C (gcc) – TIO Nexus"