Interested in contributing to Avro Project

[Nges Brian]

Hi
  I am a second year computer engineering student in the University of
Buea Cameroon-Africa.
   I am interested in the Avro project especially the C API.
  I am good in C and C++ and which to contribute to the C API of Apache Avro.
Can someone help me with links for me to clone the correct source code
for the Avro Project and start understanding its code base then start
contributing to it?
cheers