code: private boolean isProjectMethod(final InvokeInstruction instruction) {
          final MethodIdentifier identifier = instruction.getIdentifier();
  
          // check if method is in own package
          return identifier.getContainingClass().startsWith(projectPackagePrefix);
      }
docs: Checks if the given instruction invokes a method defined in the analyzed project.
  
  @param instruction The invoke instruction
  @return {@code true} if method was defined in the project