fix example code

Makefile

@@ -1,8 +1,9 @@
 BIN = shiba
 
 SRCS = $(shell find . -type f -name '*.go' -print)
+STDSRCS = $(shell find ./std -type f -name '*.sb' -print)
 
-$(BIN): $(SRCS) go.mod go.sum
+$(BIN): $(SRCS) $(STDSRCS) go.mod go.sum
 	go mod tidy
 	go build -o $(BIN) $(SRCS)
 

README.md

@@ -5,13 +5,13 @@ Below code works.
 ```
 import os
 
-fd, errno := os.open("/home/hidetatz/shiba/main.go")
+fd, errno := os.Open("/home/hidetatz/shiba/main.go")
 if errno != 0 {
     print("failed to open")
     return
 }
 
-result, errno := os.read(fd, 100)
+result, errno := os.Read(fd, 100)
 if errno != 0 {
     print("failed to read")
     return
@@ -33,7 +33,6 @@ Installation:
 Author: [@hidetatz](https://github.com/hidetatz)
 
 TODO (@hidetatz):
-- struct and method
 - error handling
 - easy and simple concurrency like Go
 - formatter

std/os.sb

@@ -1,11 +1,11 @@
-def chmod(filepath) {
+def Chmod(filepath) {
     sys_chmod = 90
     mode = 511 # 0777
     r1, r2, errno := syscall(sys_chmod, filepath, mode, 0)
     return errno
 }
 
-def open(filepath) {
+def Open(filepath) {
     sys_open = 2
     flag = 0
     mode = 511 # 0777
@@ -14,7 +14,7 @@ def open(filepath) {
     return [fd, errno]
 }
 
-def read(fd, count) {
+def Read(fd, count) {
     sys_read = 0
     buf = " " * count