Encryption / Decryption String Encryption in C

Question

Possible duplicate:
AES, Serpent or Twofish in the example?

I am trying to find a good block cipher (AES, Blowfish, etc.) for encrypting / decrypting strings. I cannot find any good examples in C. I found a ton in C # and C ++, as well as a bunch of c, but they do not support char* . If someone could point me in the right direction, that would be great.