New naming conventions to avoid conflicts.

i don't know if it was such a great idea but at least it is a starting point.

src/overlayfs.h

@@ -1,7 +1,7 @@
 #ifndef __OVERLAY_H__
 #define __OVERLAY_H__
 
-enum overlayErrors { SUCESS, NOT_INSTALLED, FAILURE };
+typedef enum overlay_errors { SUCESS, NOT_INSTALLED, FAILURE } overlay_errors_t;
 
 
 /**
@@ -13,6 +13,6 @@ enum overlayErrors { SUCESS, NOT_INSTALLED, FAILURE };
  * @param workdir a directory that will contains only temporary files.
  * @return int error code
  */
-enum overlayErrors overlayMount(char ** sources, const char * dest, const char * upperdir, const char * workdir);
+overlay_errors_t overlay_mount(char ** sources, const char * dest, const char * upperdir, const char * workdir);
 
 #endif