feat: explanation as observer too

Makefile

@@ -4,17 +4,13 @@ it:
 	@ go build -o ${BINARY_NAME} ./cmd/lambda
 	@ chmod +x ${BINARY_NAME}
 
-simple: it
-	@ ./lambda.exe -p profile/cpu.prof - < ./samples/simple.txt > program.out
+TEST=simple
 
-thunk: it
-	@ ./lambda.exe -p profile/cpu.prof - < ./samples/thunk.txt > program.out
+run: it
+	@ ./lambda.exe - < ./samples/$(TEST).txt > program.out
 
-saccharine: it
-	@ ./lambda.exe -p profile/cpu.prof - < ./samples/saccharine.txt > program.out
-
-church: it
-	@ ./lambda.exe -p profile/cpu.prof - < ./samples/church.txt > program.out
+profile: it
+	@ ./lambda.exe -p profile/cpu.prof - < ./samples/$(TEST).txt > program.out
 
 prof:
 	@ go tool pprof -top profile/cpu.prof